Mining and Trading (Eve online)

First of all, I'm looking for a panther (black ops) with covert jump generator on :) (XenoSephiroth is ingame name)

So I've now spent most of my day buying, selling and mining ores. I still don't get people who sell gneiss in high-sec for 900 isk or less per ore, today i brought 12000 gneiss (40 refines) which gave me 5130 zydrine (10.773.000,00 isk at 2100 per zyd) but only gave 630 per ore (7.560.000,00 isk), giving me an income of 3.213.000,00 isk, and it took me 10 min to get ore and refine it :D

Also i've brougt megacyte for around 3200 isk, and selling it for 4800 :D, it's true when ppl say, trading is lucrative hehe