If you're the developer of the AGPL licensed code, there's no problem in using it combined proprietary software. As the copyright owner, you don't need a license to use your own code.
Of course, if you accept patches from others, that's no longer true, unless if "force" people to dual license their code, with the second license being an exception just for you.
Of course, if you accept patches from others, that's no longer true, unless if "force" people to dual license their code, with the second license being an exception just for you.