be fair though, not all addons should have a free lifetime update or support, as coding is work, and no one works for free.
i would only suggest free lifetime support via a support forum for customers only, that way customers can even help each other and the programmer can answer questions as they're able to, also eliminating many instances of the same question asked.
gonna test out the free version of *******s credits. maybe if i like it, i'll just grab the lifetime copy for $90. if i use it for a year, it's probably paid itself off.