1) Why should we not have an internal wallet service, where when an individual advertises any crypto for sale, they should be required by the system to have the respective amount within their internal wallet of the respective crypto for the post to be approved for publication. This will help stem out scammers who advertise what they don't have and minimize scam incidences in the forum.
a) Target for the hackers
b) Added workload in regards to the publication process
c) There's also this:
19. Possible (or real) scams and Trust ratings are not moderated (to prevent moderation abuse).
What if it's implemented in a different way, when placing your BTC address in your profile you're required to sign a message using it, if the message is valid the balance will be considered as 'available'. It won't remove scammers, but will make it harder for them to use random addresses claiming its theirs, and will be easier for normal users to view valid funds instead of going through the process of manually confirming it with dealers.