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(like the guy that bought a pizza for 10,000 bitcoin)
Before the first reward halving in 2012 each mined block gave you 50BTC so 10,000BTC was 200 blocks worth.
At 10 minutes a block that's 33 hours worth of blocks and in the really early days (when the pizza buyer was mining) there really wasn't much mining competition, so that might have been a 800MHz PIII running in the corner of a room for a week.
It's down to 6.25BTC per block now (the last halving was in May 2020, they are designed to halve every 4 years) which decreases the reward. Either the price goes up to compenstate for the massive mining costs or people drop out of the mining game to increase the spoils for those that sit it out. It's a fascinating complex system.
(And, yes, I'm annoyed I didn't do any mining back before 2010...)
I did the same, I downloaded and ran it for like 5 minutes then realised it used all my GPU and I couldn't play games while it was running, I was elbows deep in an MMO at the time, so binned it off. Massive regret now.