It's $10 per year.



@everything else
The first rule of the board is:
A. We do not allow useless threads. Your thread must have an obvious topic with room for some Discussion. Examples of useless threads include: Birthday threads, leaving threads coming back threads...etc.

Pretty broad room for things to talk about and post about. The acronym thread doesn't fit this so it was closed.
I personally think that the thing to blame is just people being unable to make good threads. I'll use reddit as an example because I read stuff there quite a bit.
https://www.reddit.com/r/askreddit
https://www.reddit.com/r/askmen

Lots of questions there would be applicable here. Some are obviously too narrow to get a wide pool of responses and discussion and some are inappropriate to ask here on this forum.
When I look down the list of threads made in the last week most of what I see is trash.



There's a wide wide allowance of what can be posted here.

The goddamn mission statement is:
"Welcome. Off-topic is a board meant for less-than-completely-serious debate, idea sharing, news linking, et cetera. All these things which get posted in Discussion, but which most members that participate in Discussion don't really feel that they are suitable to a forum of the type Discussion currently is (Read: Debate). This means you can post some stuff you find interesting or new or cool here."

"Off-topic is a board meant for less-than-completely-serious debate, idea sharing, news linking, et cetera."
I don't know how much more you could ask for...

Maybe the solution to increasing activity and discussion here is to relax the rules and restrictions on what can be posted but I think that if that's what it takes to solve the problem then the problem in the first place is just that most of the community is incapable of thinking of good things to talk about in the first place.