Hitting engine with hammer - $1
Knowing where to hit - $99
It didn't hurt that he lived for quite a while.
Dali was also quite popular in his lifetime, and possibly even less afraid of self-promotion.
Living quite a while seems to be as big a factor in gaining fame as an artist than anything else - this is also important to win a Nobel prize!
That depends on the lock, and your skills. I've never managed to get the hang of it personally, but I've seen others take to it like ducks to water.