I think there should at least be a FREE tier which allows 1 or 2 forms. Once someone sees the value, they'll jump for more.
I understand that textual data is light, but 250MB seems quite low given current costs of hard drive storage.
Why the user limit too? Your costs seem to be in data transfer/storage.
But we seem to need a cheaper plan designed for developers and geeks so that they can play around Ragic with minimal investment.