Dragun, seriously? Sitting in an economy seat that is precisely the same (worse, in a lot of aspects as pointed out by Wingnut) as every other economy seat save a few extra inches of legroom is nothing like jumping into a biz seat when you didn't pay for it.
I suppose that, when a pax "volunteers" to seat in an exit row by the FAs, you'd then charge them?
I agree with GFV. Beancounter mindset.
Wingnut, add to your list no bags under the seat in front.