Only buy one if you play racing games very frequently like Forza, Dirt or Assetto Corsa. Also right now the wheels to look into are the Thrustmaster TMX and Logitech G920
I usually play up to 4 hours of assetto corsa a day. So it's great for me.
But it really depends on the person's preference. You could most likely build a mount. And get a decent set for 500
Depends on if you'd want to spend so much money on something for Entertainment, its cool if you want to use it once a month or so or if you want to play some racing games, but if you're gonna let it collect dust after 1 month of use, then no, you should save up rather until the time comes where you realize the value of what you're gonna buy
Depends on if you have friends playing race games. I've bought one and used it not that much because we Play more FPS. But it makes race games a lot nicer.