I bought all contect and races, unless drow. I also prepurchased both expansions. And I had a VIP going for 3-6 months for the special VIP event after they introduced epic and iconic 'TR'.
And about the expansion... I think MotU was worth the money. It's still one of my favourite areas in DDO and I like the quests. But ok... I really don't like the raid. But with all the other quests and stuff in the pack it's not too bad that I don't like the raid.
The second expansion was the real bummer for me...
But I never bought Ottos boxes or something like that. Was just too expensive in my opinion and I tried not to break the 12-15$/month limit. Because I also think, that if I pay much more than that then I can also go back to some pay2play game without stuff like xp potions and usually a better level of support and bug fixing.
And I bought my gargantuan bag way before I knew of any dupes. Was back in the time when I started with the game and didn't know how easy it is to get several large ing bags by doing several TRs. And at that time I needed at least one month for a TR...
The exploits never made me buy additional stuff from the store, but it increased my play experience for a while because I didn't have to worry about some evil grinds anymore and could focus on some other activities ingame.
So... I am not sure how much money I spent in total, but it's at least more than 400$.
I also know that this information should be enough to track me down in their database.