DOTLAN EveMaps

Your handy pocket guide to market manipulation ethics, courtesy of New Corp.

Lowering prices for end users is Good.
Raising mineral prices for miners is Good.
Cutting out the middlemens' fees is Good.

Charging outrageous prices in nullsec because you can is Bad. (It just encourages new competition)
Buying up all the goods on the market and reselling them for far more is Bad. (It just makes your alliance mates want to garrote you)
Setting absurdly low price buy orders is Bad. (People will just keep the goods rather than sell them for nothing and both sides will lose)