Hi Speedy,
I know what you mean, mine is a hopefully, cost neutral hobby, I'm never really sure, I keep having to buy parts in anticipation that I can find mowers to use the bits on and I know I spend too much time on many of them just to get them to a stage I won't have problems with them. I do have a number of PT motors that only need a hone and a new set of rings, but I probably have at least 35 PT's that have been straight fueled, I will probably never get around to attempting to fix those. Straight fueled F/C's I usually have enough good barrels and pistons to fix some of those, but eventually they will all dry up