There is a very simple solution for this kind of thing going forward, although it may be too late to reverse course with this girl since a precedent has already been set. I NEVER pay for non BCD dates, NEVER. I have on a couple of occasions given the girl a few bucks because I felt sorry for her on a date where we didn't go BCD, but I made it very clear that she wasn't getting "paid" for going on a date with me, but that I just felt bad for her circumstances and to just consider it a one time gift.

 
I don't mind at all going on non BCD dates, but let me repeat "I NEVER pay for them" it just sets a bad precedent and ultimately leads to the situation you now find yourself in.

 
The good news of course is that losing her won't make much of an impact on your life so you still have a chance of saving this. Here is my suggestion. In sales you are taught to Isolate the objection, agree with it, and then "overcome" it. The objection of course is she needs "more money" IMHO you need to agree with her (whether you actually do or not) that you understand that she has needs, and then suggest you two go for Quality over Quantity, IOW Suggest to her that you guys see less of each other (This keeps you from looking like she has the upper hand) but that the times you do see each other are more of the $300 dates and less of the $100 dates. Personally I think you should do away with the $100 dates altogether, not just with her, but I think you should take them TOTALLY out of your repertoire.

 
Lastly, you might also consider making the 16.6% "raise" permanent, I am sure it makes no difference to your pocket, but it might incentivize her into having more dates like your last one. It's also a solution where you can both feel like winners. You certainly don't want her resenting her dates with you. This way she gets more money and you get more pussy, sounds like a win/win to me.

Firstly, thanks for acknowledging my vocabulary!  But secondly, I'm gonna bitch slap you anyway. It's true that a BCD date that does not also include going out to a show or dinner can save some money and make giving her a few bucks on a non BCD date seem innocent enough.  But it just sets a dreadful precedent and skews the expectations.  Don't do it.  My SBs know that I will gladly pay for all non BCD activities, but they don't receive cash from me unless it's after a BCD session.  For example, I have one fascinating 23yo SB with whom I share a wide variety of interests, from my passion for motorcycles to her passion for Jungian philosophy.  The last time I saw her we went out to lunch, and spent over an hour browsing her favorite book store.  I paid for the lunch and the books she wanted and bought her a book of e.e.cummings poetry which she loved!  Then I took her home.  Both of us were just not up for a sexual romp that day and we established that fact shortly after our date began. However, the previous time we met for dinner I took her to her favorite local pizza place, then took her home for an overnight date that included plenty of sex plus her usual cash allowance.  Tonight we're meeting once again.  I got tickets to a film festival.  So we'll get dinner, watch the movies, and after that, not sure.  But she get's $$ if she comes home with me, otherwise not.  We're both extremely comfortable with this set up.  And the added benefit is that I know for a fact that she enjoys my company for lots of worthy reasons beyond the sex and the money.