"Normal" women have an entourage of beta orbiters they don't fuck and then other guys they do (alphas). They use the former for feels and validation (and moving house/etc) and the latter for sex and different sort of feels.
Your assumption is that clients provide sex in the way WL want and that they only require some orbiters for feels and validation. While a small % clients might it would probably a reasonable assumption that overall they do not. They either are not attractive - especially to higher SMV women - or because they pay they devalue themselves in her eyes. This leaves room for guys who can provide the equivalent of what alphas would provide to a "normal" woman. They might find some through work but depending on the girl this might not be possible - he is worth "less" in her mind because he started paying her.