Heading to Vegas in early May. Any stories, allowance ranges, or on the ground info you guys have? Possibly looking for something short-term while I'm there. Probably lots of quasi escort/SB combos out there but competition is good to drive down allowance and improve quality.

The only advice I can give you is the same for visiting any city:  

1. Cast a wide net: Start searching the area for POT's NOW. Send a thoughtful message to all who look good that you will be there soon. Mention that you will be in that city on a regular, recurring basis going forward (even if that's  not true).  POT's usually do not want to think of themselves as one-night-stand whores. So they may be more willing to meet you if they believe it will be an ongoing arrangement.  
2. Be sure you have a place to host. If you are travelling with a wife/GF, friend or work colleagues, make sure you can get a POT SB in and out of your hotel room with no witnesses. Or consider renting an additional room in another hotel if necessary.  
3. Plan a M&G as early as possible after your arrival. Some, if not many POT's will NOT agree to BCD with you 10 minutes after you meet (but way cool if they do!) and will want to meet the next day+ for BCD. So set up M&G's (ideally multiple M&Gs) early in your visit so you have at least one day/night after to go BCD without  a time crunch.  
4. As hinted in #3, line up multiple POT's for multiple M&G's and if all the stars align, multiple BCD's.  Plan on a minimum of a 50% POT no-show rate for M&G's and a 30% no show rate for BCD.  It's just the nature of the sugar bowl.  
5. As you suggested in your OP, probably lot's of quasi/semi-pros in Vegas and that is absolutely a good thing! It makes all the tips I laid out in 1-4 above unnecessary.  Buy you can't count on it. Still, if you already have P411, use it to schedule a sure-thing back up with a local pro. There is a glut of absolutely amazing pro talent in Vegas in the $300-$500 range which is essentially the same as the SB BCD range. So don't go home with blue balls just because you were hell-bent on getting some fresh non-pro college student or young housewife/MILF talent from Idaho.  
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Good luck. Please post a report when you get back. I'm sure it will be good reading no matter what happens.  
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Life is good.
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The Cat

...no kidding, yeah I know half of the SB list that elsewhere, but having had some experience in LV (have an apt there for tax benefits), the girls there seem fixated about traveling.  Probably b/c most of the showgirls/servers/etc are from out of town, so have traveled a bit anyway.  

I had posted this some time back, but it's my favorite LV girl profile:  
"If you are the type who thinks spoiling is allowing me to be your girlfriend... No
 If you are the type who thinks taking me to Sizzler and saying, "go ahead baby, anything you want" .... No.  
if you are the type who thinks I should fulfill all of your perverted sexual fantasies for less money than I could make waiting on tables in one night ... No  
If you are the type who thinks I should fall in love with you cuz yo mama says u handsome... No  
If you are the type who thinks you are a really fun guy yet can't find anyone to hang out with you within 500 miles ... No.
 if you are the type of guy who takes a selfie for a profile pic and it looks worse than a prison mug shot ...No.  
if you claim to be worth 50 million and offer me chump change to look my most beautiful for you...NO!  
If you claim to be a CEO and your car has an uber sticker in the front ... no.  
 If you have more fat rolls than money rolls ...no.  
If your profile pic is of Mount Rushmore...sorry but that’s not going to work for me .  
If you use your wedding pic with your wife cut out, as your profile pic, and now you are divorced ... no.  
 😘 Here's the most important tip guys : Vegas has more TS and CD than any other city. Make sure your not bidding on sausage when you come for your visit . lol "

Sorry but I remembered you said in another thread that you had met her. What's the story on tits on a stick? I started chatting with her yesterday

She fine - asemi- pro thou
Not my style, but a bit wild otherwise!

She's fun, she's fine - bit of a semipro though, which is not exactly my style.

Thank you. I spent time with her and she's exactly as you described ! Talks a lot too

No way!!
You gotta give us a serious report of the 'encounter'