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I suspect $1 is too low, especially if the 6 month theory is correct. I imagine users more likely to pay 5 or 10 dollars because the perceived value of the product is higher, making it more attractive. I feel at $1 the user might think that the task offered isn't worth it.

This is it - would a user pay a "delete all your messages just this once for $1" fee, or would lump sum work instead?

I'm also wondering about maybe selling credits instead - e.g. buy 20 deletes for $9.99. My fear with credits is that it would make the tool too complex. But again - I can only try :)

I think it would be easier to sell small products for 1$ if the web had 1-click purchases. I would not consider paying with 1$ using Paypal because it is about 3 clicks to buy something and I probably don't want to be bothered (Unless it's really essential I have it).

not a very good due to transaction costs.

Totally agree; and if it results in a support email, that's my profit blown in no time. At the same time - if everybody who signed in to the tool gave me 50 cents, I'd be a happy man :)