Comment by petcat

I'm aware of what open source software is.

And there are 3 things that you can do when in this situation:

1) Pay the fee, if that is what is required for it to continue to be easy for you to re-sell the software.

2) Fork the project, remove the restrictions, and maintain it yourself.

3) Stop using the software.

All of those are perfectly within the spirit of FOSS.