I’ve not read each post, but you’re talking about an SLA.
It could be considered as opt-in to the authors having an option for a (discounted) renewal, so if someone buys an item he’ll get 1 year of free support. After that, download will be replaced by a renewal subscription. Could (!) be handled easily (and discussed heavily).
On the other hand most auf the authors are developing their items further adding new features and stuff. So if the item reaches a new major version (let’s say 1.9.2 > 2.0) this could be the point where the author decides “yeah, the item advanced a lot so I’d like to have a (rather) small fee for my efforts”. This could be also done as opt-in for the author by selecting a percentage of the selling item price (defined by envato).
There are many pro’s and also many con’s to be considered.
For sure. Gonna write some translations for now – maybe I’ll use your form so everything stays in place…