That's your problem right thar'. Data input is tedious. Eventually (most) users stop doing it and everything breaks down.
Solve this problem, and this would be a very compelling service. Until then its sort of a "great in theory, doesn't work in practice" type of tool (for most people).
Or make a "homepage" view that I can set to my new tab screen. Each time I open a new tab I can one and only one question with dead simple entry. If there are no questions to answer, I get some stats or something.
I saw the little image with the form fields and I thought, great! Forms to fill out!
And I say this as someone who has kept spread sheets, paper ledgers, you name it.