You must pay more than the average price otherwise you won't get the lifetime VPN subscription
Fastest VPN Lifetime Subscription (1 device) - 'Pay What You Want' at Stack Social.
I already have a Lifetime Subscription (on 5 devices) with Fastest VPN. They are based in the Cayman Islands (big plus) and while they may not be the actual fastest VPN, their service is good and apps very slick.
Definitely worth grabbing as a backup VPN.