I don't mind even if you are stocking for reselling, I was just curious why buying in a gross numbers.

Good price is nice of course but if you don't plan to sell it, I don't see too many good reasons for doing that.
I can only speak for myself. At the moment, I've got 13 items in my shopping cart: 10
tanks and 3 cases.
This would be my 3rd order, but I probably won't complete it. Even though the same shopping cart would probably total more than $300 elsewhere, the pre-shipping total is only $6.50.
It rubs me wrong to pay more for shipping than for merchandise, so I've searched for something else I need to buy.
Logically I should say to myself, $7.95 is reasonable shipping for a $300+ order.
I could make it feel better by just buying a HUNDRED tanks to add to the 10 from the first orders.
No, probably not gonna close the deal on this one, LOL.