They charge X under one persona and charge Y under the other then deny doing doing it, then ultimately being forced to cop to it all due to all the peeps confronting her with overwhelming evidence.

Sad when some gals, and they are in the extreme minority here, feel the need to go to such depths to use bogus and deceptive business practices. It just breeds mistrust bewtween providers and hobbyists that needn't be there.

Fortunately, TER finds out about it many times and combines the profiles so guys can make there own decisions and look into the reasons why a girl would do that.

Sometimes the reason is benign but many times not so much. Do your homework, do board searches, and pm her reviewers to see what chicanery she may be up to.

Some gals like to reinvent there personas from time to time for the same reason that any manufacturer or performer likes to update their product and image.  People like what is new and fresh rather than old and stale.

Some gals also update their services, such as going from FBSM to GFE, or from GFE to BDSM.

Doing some research is the best way to overcome fears that they may just be trying to bury an unsavory past.

They may also be running away from a stalker or they may go from being managed to becoming independent.

First thing that comes to my mind, is that she could have had trouble with a stalker, or have been 'outed' to people in her personal life. She'd need to change her name for safety reasons.  

As others said, it could also be to avoid a bad rep, or play games with rates.  

Sometimes it's just to rebrand. She's sick of being "Sarah" and/or feels that aspects of that persona no longer portrays the image she wants. Or maybe she was "Sarah" years ago, and when she came back to the biz, she had changed...so, she wanted to create a new persona to reflect who she'd become.

for the things they do.  If you see profiles with 2 or more handles on it, admin has connected them to avoid multiple profiles of the same provider.  About the only way that will happen is if someone files a problem report alleging that 2 profiles are of same provider, and they can verify the allegation.  Sometimes they can, sometimes they can't, or won't, namely they don't agree with the prob report.  I have had that happen to me.

What's more common is for a provider to have 2 profiles with the same handle.  The most recent reviewer is to blame, as he didn't make an effort to find out if she already has a profile.  IMHO, just lazy.  

It may or may not be a red flag, just depends on the provider's situation as to why she changed her name.  Many times, as has been said, there is a very legitimate reason for the name change.  It may take some research to determine if it's a sign of no good or not.

LLAP,
Swim