5000$ / month from EU.
Well there are three names, I think who can do that!
1. Neverdie - CND income and RT income
2. Deathifier - TI + some other LAs, with unique mobs and both Hogglo Spawns on his lands
3. Qetesh, don´t know the exact number, but think she/he is the person who owns highest number of LAs. Always running some events on these LAs, and some nice spawns for different Iron Missions on Q´s LAs (Argonaut, Merp, Armax)
And there are some others, that may manage doing this by trading, but not sure about it.
High end UBER Traders, like Star, Skippie can make some 1000 PED/day. But honestly I am not sure if those players blow away all there tradingprofits in no time on the big mobs they are hunting regularly
Then we got some other traders that never skill, like Lebanner, Sarah. Those stand around at Twins all the day buying ore and enmatter. With regular customers these few % profits can sum up to huge amounts of PED. Enough PED that Sarah managed to buy an LA from her profits aswell.
You see, the investors that got LAs (not only one) and the traders that have really high turnover (many k PED / day) may manage to make such high profit.
For the traders, its a full time job, and needs a lot PED at hand to be able to buy the big stacks out of towers, too!