I do not feel picked on...And again jsh, I do not feel picked on. I am right, you are wrong, and that's that. SMILEY!!!
PS: I never ever thought about the 3G/4G costs associated with using DB. Sure you are correct. Perhaps a free service is not so free. What happens as data rates climb and everything is put in the cloud? Have you run the numbers and looked at the costs?
Well, you should. Being so wrong-headed and all.
As far as the data plan issue, I've noticed that many folks don't seem to take it into account at all. Perhaps those with 3G iPads simply consider it a $30 per month sunk cost that they seldom (if ever) exceed. But if they're using the iPad data plan extensively for streaming, they certainly will.
Furthermore, if one is using DropBox (or any cloud service) more than very occasionally via a 3G connection, the monthly cancellation feature of the month-to-month iPad data plan will never kick in. They'll be using it every month. And if that's the case, they'll consume the $100 cost of the airstash in less than four months. Of course, if they use the 3G service for other tasks, the only issue is whether a cloud service plus other uses pushes one over the 2Gig limit.
For wifi only iPad owners (and those who don't activate their 3G data plan), the cost calculation is different, of course. If they're piggybacking on a home ISP connection or using a free wifi connection then there's no additional cost for a cloud service. In that case the only downside is the potential not to be able to access the internet, at all for lack of a wifi connection.
Finally, there are folks, like me, who have a data plan that is shared among multiple devices. If the gigabyte ceiling is high enough (mine is 5 gigs), the impact of a cloud service is likely negligible, especially if one uses wifi most of the time. And unlike those with an iPad only data plan, I have no option to cancel my plan for a month and turn it back on. So unless I exceed the ceiling, there is no additional cost, at all. Likewise for those who can tether their cell phones to the iPad and share a generous data plan.
As you point out, though, data plan costs are rising, especially for heavy users. And the threat of "throttling" for those same users is likely to impact the utility of a cloud based service.