I know we'd never do it but imagine if 90minds morphed into something like TomorrowNow. The company that pissed off Oracle by offering to support off maintenance clients.
Image if for, say 8% of the software value instead of 22%, we offered to support clients on the version they are on and hired some top notch old timers who can get into the code etc. Then we put in EverSafe's (LOL) at each one to ensure that no matter how bad things went with their database we could just 'rewind' to an hour or so before.
I'd bet 15 to 30% of maintenance paying MAS90 customers would drop maintenance if they didn't have the fear of being unsupported.
Plus, we could advise on how to run old versions on newer OS's via things like Terminal Services etc.
Somebody could get rich doing this.