Maybe. Thats hard to say without reliable testing and results. But we both know that straight up, +0/0 Legendary vs +0/0 Member, the Legendary is going to get more sales.
I don't know that so not sure how you can claim that we both do.
I think that someone who treats rank as an indication of trustworthiness is begging to get scammed. Ranks in the "old" system meant just that the user was active for a certain length of time, and in the "new" system it may eventually mean that the user was active and wasn't an utter shitposter. None of this has anything to do with trustworthiness in a trade. I guess you're implying that your customers are stupid and don't know that. Fair enough. Still it seems that your effort would be better spent towards building trust than building rank.