The forum no longer auctions ad spaces so will not generate revenue from promotions. Bitcointalk has also always maintained the position of not promoting to attract users and increase traffic.
The forum has big treasury to operate for many more decades because its operation cost is not too big and it no longer needs more donation, theymos said this.
More than two years ago, theymos stopped forum ads banner auctions, it's not like stop it forever, but it's very small chance to see the admin opens it again.
Announcement on advertisement on this forum in ads banner auctions.An idea to reward quality post will raise so many subjective arguments on what is quality. If one chooses to go by merits, it will lead to increased merit farming and will overall influence the posting habits so much that the forum might lose any originality it has now.
Forum does not need to spend money for buying good, quality, constructive posts from users. What is bought with money is not organic and when you stop spending money to buy these quality posts, quality will disappear and shitposts will cover this forum. It's not intention of forum development from admins.