Earlier quoted context omitted.
What's a reasonable price to spend? You would probably spend you $15 to go see a two hour movie... I bet you can get away with spending under $7.50 per hour on M:tG. But it is a very expensive game if you buy all the cards and only play it once. I still have cards from the 90s, I don't think I've bought anything in 20 years. Still fun game to play on board game night with friends.
fyi, your cards from the 90s might be worth thousands of dollars.
Also, where's a good place to sell? Online or in-person?