0.0005 btc is too low to spark interest of any would-be claimer. You should make it at least to the equivalent of 1€ or don't do it at all.
50000 satoshi looks definitely better
But yes, 0,2$ could be too less for attract anybody. Maybe there could be a program, that would allow people to get some decent portion of BTC under some conditions, like making some amount of transactions or something.