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Hey.. is trader EP = to player EP?
Yep
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And.. I collected my 1000 cn. and 4000 cr.
I'm guessing that you mean as a trader
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And.. can we sell to our own character (but delete the cash completely? There aren't a lot of traders out there )
Nope, can't in any way trade, sell, or give items to your own character. Sorry about that, I'm just thinking about the future and believe me, there will be more traders as time goes on. Don't wish to flood the place yet.
There are others who can have traders currently though, and don't worry, NPC merchants will be around hopefully tonight where the money can be used.
Now to buy as the trader or to buy as your character... That is the question. Why would you buy the item for the trader? Well, in the long run you'll get a profit for it. I can guarantee some trader-only augmentations for those NPC merchant-bought items in the very near future.
So I'll recommend that if more long-term business is desired, your trader should make more purchases unless there's something your character needs.