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With Lite and Pro you only make money on the Pro.
Lite costs you money (bandwidth), and Pro earns you money right away, but puts you in the "support for life" spot.
If you're in for the money, make one version that gets more complicated and needs more paid support with each release.
If you're in for the big money, keep it closed source, sell the appliance cheap just to pay the rent, and sell the whole concept and customerbase after a few years.
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