I just put about $1,000 into a complete brake overhaul, but that's the kind of shit I expect at 140,000 miles. I would have been a little upset, and the timing kind of sucked with my wife going on (unpaid) maternity leave the month after we had the work done, but 1) the brakes definitely needed it, and work a TON better now, 2) that $1k is only 2-3 months of what a payment would cost, and 3) I'm definitely keeping the car long enough to get my money's worth out of the new brakes.
I don't have an M5 in the garage for non-commuting duties, but I also don't think I'd drive one if I did. More money for bikes and guns (in theory...)