Your best bet would be to follow the OpenX model - Release a community friendly version of your software that anyone could install on their servers, (would be g

Your best bet would be to follow the OpenX model - Release a community friendly version of your software that anyone could install on their servers, (would be good if it was open source; not necessarily free though) and also at the same time, target the Enterprise guys with a hefty premium plan, by offering a hosted service,with some extra features and with Service uptime Guarantees. I see no reason why you wouldn't be hitting the gold pot, this way.