Mind you, it's not the same price not by a long shot.
I became Lifetime sometime in 2012. and paid about 50-60$, if I remember correctly. There were no Lifetime Plus back then.
Then, when, Lifetime Plus was new and it was recurring payment, I wasn't a fan of that, so I waited, but of course was completely satisfied with everything on CH and everything was available to me, no extra cost. And it would have been like that forever, just like it is for you now!
And, then, last year I bought Lifetime of Lifetime Plus for 500$, just because I wanted to support CH even more. And I became Tier 7 yes, but again, that only means I get extra visibility on forums, extra entries and/or special prizes in giveaways and unlimited Aurora offline keys; all other things are and will always be available to you (and everyone else), even if you stay only "normal" Lifetime member!
😉