Heck, I almost BOAT on the lawn-mowers pre-season and that was just for a couple replacement spindles, stack of bearings, blades and a few belts (and there's 2 belts I forgot to order, not sure how they haven't popped yet).
Nothing was wrong, per se, but spindles were getting sloppy, 1 cracked 1 spun a bearing and both are obsolete now. But at a new replacement cost of somewhere between $15-20k for 2 comparable mowers I can afford to stick a few bucks into these that I spent a total of $3100 on and have beat the snot out of for about 8 years now.
Now if one blows an engine or a hydro pump or motor it's going on craigslist for parts!