I'm not sure about the answer to your question about different fees for microtransactions, but with their pricing, you would never get charged 25 cents. The minimum charge is $1.
The first four pages are $1, which I'm assuming is partly to cover that issue of their charge getting eaten up by payment fees.
The first four pages are $1, which I'm assuming is partly to cover that issue of their charge getting eaten up by payment fees.