The GPL does not restrict you from selling software. It explicitly allows you to do so. Section 4 of the GPLv3 reads:
You may charge any price or no price for each copy that you convey
The recipient then receives the same rights, so they can also choose to give the software to another person for a price, for free, or keep it for themselves. The price they charge is completely independent from how much they paid for their copy. This is also explained in the section "Does the GPL allow me to sell copies of the program for money?" of the GPL FAQ
Regarding "9.License Must Not Restrict Other Software": The GPL doesn't do this. It is only "viral" in the sense when GPL code is combined with other code to create a new piece of software. But as long as a GPL and a non-GPL program stay independent programs which can run independently, neither affects the license conditions of the other and they can be distributed together on the same medium. The GPL FAQ says about this case:
in many cases you can distribute the GPL-covered software alongside your proprietary system. To do this validly, you must make sure that the free and non-free programs communicate at arms length, that they are not combined in a way that would make them effectively a single program.