So what if I bet my friend a coffee that I can make three trash-can baskets in a roll? The price of a coffee is not going to hurt anyone.
So what if I put a dollar down for a lottery ticket? Who's it going to hurt?
In both cases, it won't really hurt anyone. But what's the motivation?
The only way I can win is for you to lose. Therefore, my motivation (assuming I want to win) is for you to lose.
Hardly the epitome of the Golden Rule, now, is it?
He who is faithful in a very little thing is faithful also in much; and he who is unrighteous in a very little thing is unrighteous also in much.
-- Jesus, Luke 16:10