[Skryptec]

Well there's a number of things we can take into account here.

Most new users that create a shop will 100% be asked for a vouch copy to prove that the item they're selling is legitimate & working.

New users understand that and usually give a vouch copy to a trusted member or, even Oni if they'd like. https://sinister.ly/Thread-Vouch-Services

Another thing you could look at is if a member is pretty much only registering here to use the marketplace, given the fact that they need to make a post requirement to do so they could possibly spam the forum until they reach the required post.

A suggestion I would personally agree on would be a reputation requirement, this way they can't just spam the forum to get what they want as they'd get negative repped.

What's your thoughts on this?

On the other hand, reputation shouldn't affect if someone is legitimate or not. I mean, a new user can be legitimate and a old user can't.