- Adding new subsections, as you propose. They could include: gift cards/coupons, domains/websites, scripts/templates/software, ...
- Better checking for items not on the right sections, too frequent bumps, illegal items, ... Maybe another moderator is required in addition to the existing ones.
- Showing trust to guests or requiring to register before visiting that section
- Disabling self-moderated threads and not allowing to unlock locked threads
How have I never noticed your threads? The last three are especially true. It's completely necessary, and I imagine the fix is extremely simple and won't take 5 minutes. Self-moderated threads should not ever be a thing, locking threads to unlock for a bump should not be a thing, and trust should always be visible. I'll visit your threads, the marketplace could be so much more active and efficient, as well as alot less scams happening if these simple changes are made.
The self moderated threads were largely put in to place FOR the marketplace section because some users would use them to harass/troll people trying to trade legitimately. The logic being a sales ad does not necessarily need to be a conversation, and any fraudulent activity can be dealt with by rating, posting in scam/rep, or reporting forum abuses. The same goes for locking threads. It is a mistake to consider only the features valuable to you personally as the only valuable features, because that kind of thinking works both ways. I would suggest a rank requirement to post any digital goods. The only problem is, as it is now, people will try to post digital goods in other sections to get around this mess. About 80% of the posts I report in the goods section is stuff that belongs in digital goods currently, so there will be blow back to other sections as a direct result.