you can run brushed motors for a long time without skimming, but the performance will drop and the com will get ruined.
Even with the V2 motors or checkpoint motors it is best to give them a light skim after each meeting as this will keep them in top performance. If you don;t skim them for several meetings the performance will drop and when you come to skim it you will need to take off a very thick layer of copper in order to get a smooth com again.
A lot of racers have lathes and if you ask them nicely will probably skim them up for you for a token gesture fee of say £1 towards the lathe bit. Alternatively if you plan to race regularly then maybe pic up a second hand lathe - they are pretty cheap (£40 ish) as brushless has really knocked the value out of them.
The checkpoint motor is the best of the brushed variety. Very fast, plenty of torque, and the brushes would last for around 50 runs (10 meetings). Try and pick up a second hand one, the 10x2 is very good in 2wd. Don't get a single wind for 2wd though.
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