I don't see that happening. They would have to offer support for the new product and most of my marketing is word of mouth nowadays. Should work out just fine ;)
Every open3ABox has an open websocket connection to my server. I do the monitoring over this connection and for updates and support I tell the box over the websocket connection to forward a port via ssh to my server. The port will be automatically closed by the open3ABox after three hours.
This means no constantly open port and an encrypted connection where only my server is allowed to do a remote function execution (get monitoring values, open port, etc.) on the box.
I do this because I'm in it for the long run. Sure, maybe it won't pay off, but my "first directive" is, to get people to use my open3A. If they've put all their data in it and miss some feature in the future it is more probable that they will just buy it from me instead of going through the hassle of moving to another solution. If they have a good support experience that just gives them a better feeling with my software.
Yes, I could do that, but I could not support the users of e.g. a spanish version because my spanish is quite poor. This is why I settled for the german speaking market. That's Austria, Switzerland and Germany. Still enough money to earn :)
I create and sell business software for writing invoices and managing customers. It is also available for rent and I use the following stack for my own cloud:
Debian, KVM, Apache, MySQL (with Percona for clustering), GlusterFS, rSync, HAProxy, PHP, jQuery
I actually own 3 servers :) I know, it's super boring, but this stack has only failed me once in about five years.
Yes, in my opinion this stack has helped me a lot in earning a living with my company because it just works and saves me time to do other things that earn money.