Maybe I'm missing something, but it seems like buying property and businesses isn't a good use of money. I've completed the campaign and have all of this money to spend, but I don't want to drop millions on a business only to have it take 30 or 40 weeks of in-game time to recoup my initial investment. I know there are some missions to be had for certain properties, but other than that I don't see any compelling reasons to buy these things. I've got enough money to buy any vehicle, outfit, or gun I want...what's the point? I was thinking about playing BAWSAQ to earn enough money to buy the country club, but even that seems like a waste.
Did you bother with buying up all of the properties?