Usually, when you buy more you get better rate. Is it not so? So, why is 200GB space more expensive (per GB) than 100GB space?
I think, the pricing manager has to take a trip to a local supermarket and see how it should work. (or perhaps they don’t care)
Price per GB:
200GB –> 9.995 cents per GB
100GB –> 9.990 cents per GB
(I think, 18.99 would give the fence-sitting-customers the incentive to buy more, even when they need only 100GB => win for Dropbox)