Who plays Tabletop Games? Everyone.
Ok so maybe not everyone but the demographic for tabletop games is essentially everyone.
Breaking it down a little.
If you enjoy sci-fi, fantasy or any other fiction based entertainment (including TV) then there's likely a tabletop game for you. Towards the end of the 1st Chapter part of my job was to help identify what games would appeal to what people as after all I was trying to sell them.
Do they not cost lots of money though? Well that depends on what you want to play and how you measure value for money.
If you're only going to play a game, any game of any format including video games, just once then yes it's probably not value for money.
Part of the barrier of entry with tabletop games is knowing that you'll play the games more than once. By getting the right advice from people who know what they are talking about (and in the main I mean people who own shops dedicated to these products) you'll find a game that suits you.
Let me pick on a couple of examples.