This is one awesome feature which makes the site even better if possible. It's not like I'll be using it that much as I don't collect originals so frequently (money...) but it's good to know there's another place where you can look for, and I'm sure some people will use it quite actively.
One little suggestion: I think it'd be nice a "browse all" page for both the sell and wish list when you want to have a quick glimpse aat what people look for/offer
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My old Stepmania simfiles:
here and
here
MAH BOI, this peace is what all true warriors strive for!!