People cheat in life in general in any way they can, i.e. r/c racing, slacking at work, livin' off the government etc., etc.
I don't associate with those people as I hold myself to a higher standard.
Life isn't fair in any aspect, even r/c racing. Be the best person/r-c racer you can be and let others do what they do.
At the end of the day you will have more, and better friends. Which is way more rewarding than an ill gotten race win. Live and let live