Maybe this is an entirely dumb question but – how's business?
I've paid for two licenses so far (Sublime 2 and Sublime 3) and I've made sure my employers have done the same on the few instances where I've had to ask for it – don't regret it for a second. However, this is literally years of value out of this magnificent piece of software, for all but a couple of hundred bucks. The number of times Sublime has saved my bacon by keeping text buffers persistent while my machine unexpectedly crashes or for some other reason decides to restart is enough to warrant the price of admission many times over.
What I'm saying is, it seem to me that charging $80 for something including in-between updates seems, I don't know, cheap. I can't believe I'm saying this, but I think I want to throw (at least a little) money your way. However, I can't quite justify buying more licenses (bean counters gets annoyed with that.) Have you considered subscription models or forcing new license purchases by forcing yearly releases or something? Maybe support contracts?
I don't know. I just know I need Sublime to work, and continue working. Maybe your business is super sound and you know, in that case, just carry on I guess. Just throwing some thoughts out there.