My concern with "membership" is this situation... say someone upgrades at the 6 month point (like July) with say 3 patches released... 1) I would presume that the patches are included in the upgrade for them? and 2) if they pay-by-month and only buy one month, they now have (for $50) what
loyal customers just paid $100 (or $149 for the one-time upgrade) for. Since one "gets to keep" what they paid for, this new marketing strategy is confusing (to say the least).
I have never seen a company "retroactively" charge for patches... so the above situation is concerning to ponder.