Wouldn't you feel just a little bad if you worked really hard on something, gave it out for free in the spirit of sharing, and someone came along and said thanks, loser, and sold it for money? Would you want to go on making it for free for them to sell?
>>bulatb+(OP)
No, not really? If others can get my stuff for free, then that means that whoever sells it for money must have done something to make it worth money. So they've earned it.