While I’m not sure I get $156/year worth of value from Prime, or even $99, I share my account with 2 other close family members, and together we place enough orders for it to be worth it. Same with Costco etc. — so as long as These services remain easy to share, the price increases are aren’t too bad.
I too am lucky to be grandfathered in. But can’t really say it is a current Prime benefit anymore.