A new company, FileConversion.Net, is trying to make a commercial service out of converting files online. If I were trying to make money out of FileFormat.Info, they'd be a competitor.
They want to charge $40 per year for the service. While this is not an unreasonable amount, I think that it is high enough to kill demand. It will present a real hurdle for people that are not certain they need it. And for people that definitely need it, they may be willing to spring for something they can install and own directly.
One of their established competitors, Advanced Computer Innovations (ACII) charges $10 per Mbyte plus $1 per file, but they also make money selling the software.
I think a much lower fee (micropayment-level, $1 or less) would be much more viable.
File Formats: (none)