Surely it's my problem and my problem alone if I want to lose the opportunity to spend my money in something fruitful to instead spend it in something pointless and worthless.
>while we could have had a new hospital or brigde
Well, no. It was my money I spent. Regardless of what I was going to do with it, building hospitals and bridges was never in the cards.
Let's say that I made my fortune... whatever, selling tickets to football games. Well, the opportunity to do those things was lost little by little every time someone bought a ticket. So what do you want? Do you want a centrally managed economy where individuals cannot make purchasing decisions? You do your government-assigned job, you get in line for your government-approved meal, and for entertainment in the afternoon you can attend a play about how great the ruling party is and how everyone must do their part for the good of the nation. There, that's what an economy with no misallocated resources (by the parameters you've set) looks like. No one can incorrectly spend their money because there's no money to spend. The government has complete control.