If you want to do a giveaway. PM keys to random members. The way you are doing is just going to benefit those few who use bots to read the keys and send them off immediately.
Actually, the way they are doing it ought to just benefit the mining pools, unless they just can't be bothered to try to collect such minuscule amounts.
Any pool that decides that it's worthwhile to confirm transactions that include these outputs, can simply ignore any transaction funded by these outputs (even if they are sent by bots) and create their own transaction big enough to fill any available space in their block with a single transaction (or few transactions) that use up as many of the outputs as they can fit.
I wonder what it would cost to move these outputs.... 
