Nothing you can do really. Just avoid reviews of white providers wanting more $ than the Asian girl do and you'll be alright. One of the white providers is even doing multiple posts on herself. You think hey would get a clue and see that guys are tired of getting ripped off and over changed by them.
And yeah there are guys looking to get free access but again theres nothing you can do about it. Just look for reviews by trusted posters and you'll be fine.