There are various 'reasons' given, for not seeing black guys as far as WGs are concerned.
Like anything else, there's often more than one factor at play. I think in some cases these factors do indeed simply hide racism on the part of the WG. In probably a lot more cases than that, ignorance and misunderstanding (probably more prevalent in EE WGs who come from a background with few ethnic minorities). And in some cases the exclusion will be from personal experience.
They vary, from:
Love you guys but your cock is too big.
Bad past experience.
Got robbed.
Black guys are not my type.
Etc.
Also, as has been pointed out here (and in other threads) not all black guys see themselves in the same light, and also their experience with WGs will differ.
I've read in several threads where black punters muse on whether girls can 'take the D', whether they can take it deep, whether they can take a good pounding or have their back doors smashed in, also tied in with a strong allusion to (or even direct reference to) their big/over-average cock. Looking at profile avatars can also give clues as to someone's punting persona too...how do we all 'see' ourselves?
I see other threads where black guys are at pains to point out that black guys don't have bigger cocks, that it's a fallacy - they don't want to be pigeonholed with that.
Every girl is built differently too, and ultimately they are working and need/want to generate income. Simultaneously, sex is meant to be at least somewhat enjoyable, so there is a dichotomy there over the money and the enjoyment. A good bout of unbridled and wanton sex is something a highly sexed 'civvie' woman might enjoy every day, but doing that 4 or 5 times a day would take its physical (and mental?) toll.
Even within this thread there is talk of black guys fucking as many girls as they can, for the experience, yet simultaneously talk of black guys being 'sexual and cultural individuals', with their own views and experiences.
I think it's fair to say that all black guys are gonna be disappointed at girls who choose to exclude them. No-one wants to be singled out for exclusion, because it is inherently personal.
I'm on the outside in all of this, so my perspective is from the outside. But to me it just seems to be a case of: you're paying for sex, if some WG doesn't want to see you because of the colour of your skin (and whatever 'reason(s)' may be behind that) then simply move on to the next girl, because the vast majority are happy to, infact some actually state in their profiles that they positively love to see black guys.
I'd also say that if the 'reason' given by a WG not to see you doesn't apply to you personally, then don't be offended by it. There's nothing you can do about it, there's no national regulator like Ofpunt to whom to take grievances, prostitution is inherently casual labour, piece work, the ultimate gig economy, and it always will be, it's on the fringes of the employment arena.