For large ticket items, subscriptions, like leases, may be a good way to go. Most modules in the Market are not that expensive so a subscription model in those cases is not a good ideal. If you decide to try to go with subscriptions, it should be up to the vendor to decide to allow a module to be sold by subscription. Coding in a call home for a $20 module means that the module will no longer sell for $20 so you may end up driving up module prices.
Andrew Boon
Yep, I believe it should an option. Just a way to create separate listing, perhaps for bigger modules that need continuous support and development. Also call-home can be bundled into once-a-month-for-all.
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