servos and motors

[B4 Sloth]

I went racing for the first time on Sunday, really enjoyed it. I raced my factory team B4 and have got the bug. I managed to strip the gears of a metal geared servo- could my servo saver have been too tight?
After 4 5 minute races the car became 'glitchy' on acceleration. a couple of the lads were really helpful and said that it was probably brushes. We took motor apart and it apparantly needs a skim. The car had only seen a bit of action (30 mins or so ) in my cul de sac. PEAK RAVEN SV2 13x2. Are all motors like this, brushes cost a few quid and then a skim? Surely you must to be able to get more than that out of a motor? I am on a budget and in hindsight wish i had gone for brushless..but i didnt, So i need to get round or over this hurdle! Should i have spent more on a better motor? As much as i loved the day it may prove to be an expensive hobby...new baby on the way i dont want this to be the case!!
Thanks all, particularly Braxted MERCC