I found this thread thinking "I am going to remove the branding". I have reconsidered.
We would all be better served by leaving the branding in place. If Blesta is more popular, we'll get more resources devoted to Blesta. A Chevy is less expensive and more reliable than a Cadillac, one of the reason why is because they make more Chevy's. I want more people, many more people to buy Blesta!
I don't see how it hurts my business to promote Blesta within our billing system - my homepage, that's a different story, no web designer gets to put "designed by..." on my homepage.