I don't know what is your experience but I noticed a lot of POT SB that when they find out I am married, they are not interested anymore. Does it hurt to be married. I know that the pros and semi pros could care less but the real SB seems to care

Keep looking. They come in cycles. Over the summer I had a handful that seemed to ignore I was married and then suddenly had the revelation that my profile said I was married. Just had a first date with a beautiful Latina SB who didn’t care I was married.

Some SBs refuse to date a married guy, even after I explain my wife knows all about my dating and gives her permission, they still refuse.  It's just a mental barrier they have up.  Others don't care at all.  But most of my dates have mixed feelings about enabling a guy to cheat, so they are relieved and happy when I tell them my wife approves.

A married guy is going to be less available with his time or money.  So even if they don't have an ethical object they may have a financial objection.

Alright, you can be married and still bang hookers and definitely have sugar babies, but why be so honest? And if you do have moral codes of conduct then you should just stay home with your wife

... with SB's that have kids.  
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Many SD's, including me are reluctant to take on an SB with kids. This is especially true with younger kids, say under 14.
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Why? A single mother will (and must!) always prioritize their lives around their kids.  That means at best, you come second (pun intended) and that you are quite likely to get sugar requests for kid stuff, kid emergencies and kid help well beyond the anticipated spend you budget for a single SB.  It also means in the unfortunate event you accidentally knock her up she will almost certainly have the kid - at then you are on the hook for 18+ years of mandatory, legally required Daddy Sugar!  
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It's generally not as big a concern when the kids are older (18+) but for your SB to have an 18-year old she is most likely over 30 herself. That's well over my desired SB age range of 18-28, although there are many on the boards who have good success and satisfaction with 30+ year old SB's.  
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Note that I am not anti-kid! I love kids and believe that a parents' most important job is to raise their children to be positive contributors to the world.  I'm just not willing pay for some other guy's kids.

messages from women who vehemently objected. Often younger, college aged, but older ones too.  

I had no idea you were related to Roy Moore? Just what part of Alabama are you from anyhow? lmao.

LOL.  

Even in my example she will be well over thirty by the time her son turns 18, for a woman to NOT yet be thirty and have an 18 year old child goes well past being "Roy-Moore-ish. lol It would require her to actually have the kid by age before the age of twelve, which means getting pregnant when barely 11. You aren't talking about teen pregnancies, you are talking pre-teen. lol

I wish SA would filter who you see and who sees you based on preferences

My profile says I’m married.  I’ll tell them during discussions too.  I’ve had very few have a problem with it.  I just signed a new young 21 y/o up.  Pre med student, well spoken, good hobbies etc.   Her response when she found out was “I feel like a dirty mistress”,.... “if I ever want to back out are you ok?”  I said sure.  Well during our first encounter and after her 3rd “O”, I asked if it was a problem. She said, “you’re the best fuck I’ve ever had, no problem!”  Experience wins, moral compass loses.  I’m just glad she must not have had too many guys before me.

From an ethical standpoint, I'm honest, because I simply choose to be. There'a a complex line of thought behind that, but ultimately, it's just what I choose.

And then I explain that things are hot and cold with the wife and that I’m trying for an open marriage and have even sent the wife on vacations with her single friends to encourage extramarital sex, which is all true.  A few don’t like the fact that I’m married. Most don’t care. I do get better initial responses by saying separated vs married.  

when I said I was separated. You are married and I can tell. This was during the first F2F. I denied it at first but she said I don't care. That was refreshing.
Next time I get back on SA, I will say married but looking and see what hits I get.

A POT recently sent me an unsolicited message: "I’ve never been with a married man but I find the idea fun and exciting " We haven't met yet but she seems promising. On the whole, being married has limited my options in the sugar bowl very little, and in several cases probably enhanced my opportunities.

Actually being married is social proof (not much, but some.)

I am upfront that I am married, and they generally are too. Some of my best experiences in the sugar bowl have been with unhappily-married women, usually in their late 20s or early 30s. They are generally more fun in bed and more relaxed about sex than the typical college-girl SBs. We generally leave our rings on and pretend that we are married to each other in hotels and restaurants.