Which is why the game should end as soon as there is a clear winner. I find tipping the board over to be effective in this regard.

To go a little off topic: this is the same style of poison that causes MOBAs to have such toxic communities, exacerbated by almost complete anonymity. At the lower levels, easily 95% of games are decided in the first 10 minutes but last 30-40. Only once you reach professional or near-professional play do you hit the point at which most games end within a minute or two of the winner becoming obvious.

Quite. When played with children (of any age) it frequently ends in tears.

Monopoly's predecessor was The Landlord's Game, designed to teach people about the evils of capitalism. You moved around the board, got robbed, it wasn't fun.

Monopoly changed it up by making it possible to become the evil landlord, and that's what made it successful.