Not sure why you insist on conflating SB's with Hookers. To be sure there is crossover! But my experience and my unscientific, anecdotal, empirical evidence across California suggests that the crossover is less than 5-10%. Interestingly the stripper-SB crossover is much higher at around 20%. (Or that's just an artifact of the SB's I choose.)
SB's, unless they are also pro's, don't have TER reviews. If they do, those reviews are in the context of being an escort, not a sugar baby.
I never said either an SB or escort would object to more money. Obviously that will never happen. But talking to an SB who is not a pro like she is one by using terms like tip (instead of "present" or "gift"), rates (instead of "allowance"), appointment (instead of "date") or such will likely break the fragile perception they maintain (mostly in their inner-monologue or with the friends) that they are NOT a hoe, but just found a nice guy who helps them from time to time and who enjoys her company. Again, I'm talking about how an SB perceives herself and how she justifies sucking dick for cash as NOT prostitution. Not how you or I think about them.
Finally, in the sugar bowl, "rates" asked for tend to go down with increased frequency and over longer periods of time, while overall "sugar" provided tends to go up as SD's are willing to pay for more non-sexual activities and items for SB's they enjoy spending time with. Yes, over time both SB's and hookers get a better view of the competitive landscape, and they adjust accordingly. But why push them along? Or are you the jerk who always pays double the web rate because you think she deserves it, thereby screwing the rest of us (or unscrewing, I suppose :p ) of a fair-market priced session?