Other than the pride of knowing the gears aren't chipped, if your not racing that thing, those gears will go a long while yet..
I have put trannies together (and been advised by the transmission shop to do so) with chipped gears and never really had a problem.
You may want to take a Dremel grinder and smooth the edges, and check for cracks in the teeth but those gears will still run.
Good enough is near enough...for some. "Yeah mate had one like that years ago...still runnin' fine (if ya ignore the noise and the crunch from time to time". "Mate, ya shoulda been here yesterday, some clown comes in and says about a pile 'o' junk parts; maaaate whaddya worrin' 'bout, just put the f#@&ing thing back together and no one will ever know, ya wanna know the best part; we charged the sucker the full price of a new built ******". "Mate, there's one born every minute and it's just my luck to get them comin' in here all the time, no wonder there's so much s#$t out there, I just can't help but keep makin' it, on account of my slack attitude and pretend cheap prices".
And when it all blows up and turns to crap and his case explodes, hey, we'll sell him a 'reconditioned' one of those as well. We charge extra of course, on account of the 'reconditionin', ya understand.