yeh, everyone seems to want roiding to be easier, but getting themselves defence to be easier as well :P
i see what you mean about returns on roids, however i don't think your numbers are particularly great. people tend to roid if they'll get a payback, if the best planets are taking 3 days to pay back losses, odds are people will attack them - otherwise they'll get left behind, so i don't see that as too big a problem. however, a balance between ease of attack and defence is important, i agree.
problem at the moment is that alliance players are more likely to get defence than not, whereas newbs probably won't, hence the bashing in the first place, even if targets are less juicy people would rather hit something that they know will work, than hit something they don't believe will. however, changing this directly would probably annoy the alliances somewhat
although, when i last payed attention i found the att/def balance slightly too far in favour of defence. however, there's also a lot of problems with combat being too predictale etc etc, so that's a matter for another thread really.
-mist