msarca - it might be worth looking at the wording on CleanShot’s pricing page. I notice they avoid the word “lifetime” entirely. I wonder how much confusion they still get.
You keep talking past people.
The feedback they're sharing is very simple. It's not super clear from your sales copy if my purchase gets me access to all updates forever, or if those are limited to the current major version. The way you're intending it to work is simple, yes, but your sales copy doesn't reflect that.
It seems like an easily solvable problem, tweak your sales copy to clarify, but instead you keep digging your heels. Fine, it's your company. I'm not a lawyer, but generally I'd be worried about making a bunch of sales if its not clear to my customers what exactly their buying. I don't get why you'd take such a chance when the fix is so simple, but again, it's your company.
My product was originally offered as “one time purchase, one year of updates”, and the customer confusion/anger didn’t show up until I offered a discounted early renewal over Black Friday a few years back.