I don't like the idea in general, but it can save time.
First, I wouldn't put the info in your profile. As noted, that may make the legal status more spurious.
Second, SA may not like it, and you may get booted. That said, I have seen profiles of about half a dozen SBs who mention a dollar amount as their minimum (one I saw this summer for $250 now asks $400).
Third, it causes you to overpay. As noted, in negotiation, make the other party give a number first. It may be lower than you expect and are willing to pay.
Fourth, it draws those focused on money. These are the ones who will want taxi fare, money to meet, gifts, etc. Of course, most SBs expect cash (I know of a few who don't), but some are TOO focused on it.
Fifth, it establishes only one parameter and ignores some possibly more important things. You may be willing to pay up to $400, but what are you are getting for your money? I like to know the product before discussing price. If the SB hears $400, she may assume that she can give you a quick fuck and be done in 30 minutes. OTOH, you are wanting 3 hours, multiple rounds, DFK, DATY, BBBJ, and CIM. Those things need to be discussed--tactfully--before discussing price. Do you go into a restaurant and think I'm willing to spend $XX on dinner? No, you look at the menu first.
Sixth, one of my friends cites a range. He claims that the women take the low point or midpoint of the range. If I were a SB, I would think "What is wrong with me? He paid $XXX (the top of his range) before, but he's offering me only the midpoint?" I don't think you can assume that the midpoint will work. When SBs have quoted me a range of what they have gotten in the past, everyone has agreed to accept the bottom of the range.
Seventh, and most important in my view, it chases away the SBs who are interested in chemistry, which is the group that I am most interested in. As we know, many SBs have an odd mindset about taking money for sex. Downplaying the money issue as much as possible is the best approach in my view.
As noted, citing a dollar amount likely will save you time in your search, because the women are effectively agreeing to that amount. But I think you are better off spending that same amount on a pro whose menu and reviews are readily available