My record is 26 million NPs. I used MachAB (can I say that here?) for about 5 months last year before my account was frozen; and yes, it did take TNT 5 months to freeze my account. I only ever restocked in the Magic Shop and managed to make 26 million from about 150k Nps. At the time of the freezing of my account, I had another 15 or so magic potions I was trying to sell, 2 of which I was holding onto because I couldn't find any others to price them appropriately.
What do you think my mistake was? My friend says I should have bought something big to make it look a bit less suspicious, but I'm not so sure that was it...
So, what about you, what is the most amount of Neopoints you've ever had?