Grey - Guest member, no credits and they can only view, not chat
Yellow - Free member, no credits
Blue - Member has a credit card on file, so he can buy credits instantly
Green - Member has credits to spend

Therefore, you should focus mostly on the Blue and Green members, but be polite to Yellow members. Remember that every Blue and Green member on the site started out as a Yellow member. The reason members upgrade is because they have a positive experience with a model on the site. We know some Yellow members can be annoying, but if you're rude to them, you're only hurting yourself in the long run.
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