I'm not 100% sure I understand what you are asking but...
Mainstream offers stand out the most to me. They usually have some sort of button, tag, or ribbon, or another eye catching graphic with "SPECIAL OFFER" or "OFFER" inside of it. The right graphic really catches my eye.
Adult sites usually seem cluttered and unfocused, so if they have an offer, it often goes overlooked. Also hard to notice an offer when you can look at tits.
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