Earlier quoted context omitted.
Absolutely. Time to start charging for it - you've got something here. Might as well pick the fruits of your labor.
Amazingly, this (and the root comment up top) are actually getting downvoted. I hadn't realized the sentiment among open source developers against making money from their craft was so strong. But it shouldn't be. We, as developers, shouldn't harbor any ill will toward the OP should he decide to pull the open source version and sell it for profit. We certainly shouldn't advise him against it or recommend an alternativ…
As a user of proprietary software, you can't inspect that code for bugs and you can't inspect it for malicious code - you just have to take the vendor's word for it that "it is really secure, honest! And there aren't any backdoors put in by the US government/china/whoever"
I don't know whether chatsecure is any good or would withstand attacks by a nation state, but if I were a security researcher or an aid organisation in the 3rd world, I could look at the source and find out.