I'm learning how to do the most critical maintainence on my saws, but I'm not as bad about it now as I was a year ago. My chains are mostly in better shape than that, my bars are straight and true (most of them are anyways) my entire home looks like I live with leatherface and his psycho family. I have saws everywhere except for the bathroom bedrooms and kitchen. Not too often have I seen a chain like that, but I did have a neighbor with a little Eager Beaver 2.0 with a 12" bar on it, a worn to death drive sprocket, and the sprocket in the nose of the bar came out one day while I was cutting, I dont know how that happend but it did, then I swapped the 12" with a 14" I had from a Mac 130 I had once and it worked just fine, then he goes out get a new bar and chain, but no new sprocket to go with the other new parts, I'm going to see if I can bring the saw over soon to rebuild the carb, and I'll order a drive sprocket to replace the one on the saw at the same time.
Some people just dont understand the sawchain has to be just so for it too work properly, others just dont see that uneven bar rails will cause the saw to cut circles in the wood, some are just not supposed to have a saw at all. Then there are the people that think that you can run plain gas in a 2 stroke engine, I wont even begin to get into those people.