Pricing is based on the total amount of code generated for all files encoded, and there is no charge per file!. Charging is only based on the actual code, and pure HTML typically costs virtually nothing. Encoding an archive of 20 HTML files might cost the same or less than one more complicated PHP file.
Cost is based on compiled code size and not source. Comments, white-space, expansive code layout etc. cost nothing.
Encoding web sites is particularly cost effective because of their low complexity relative to the other examples.
To get a price for your own project, just upload to the online Encoder either as a test or pay-to-download encoding and the price will be given.