What would you do with your bitcoin if you could never sell it

NOTHING
People can (and do) use Bitcoin for things other than money. You can send a transaction to yourself in order to
permanently record a message in the Bitcoin blockchain which can never be deleted or censored. Name another form of money which can do that.
You keep focusing on bitcoin (the unit of account), but conveniently forget all about Bitcoin (the network, the protocol, the blockchain) and you can't use the network/protocol/blockchain without owning the the unit of account. If you don't incorporate those things into your understanding, you will never comprehend why we see value and you cannot.
Good points, but he doesnt even get the basics yet. That the success of money isnt dependent on its uses outside of being money. All of these Bitcoin haters keep bringing up what they cant use it for and that this is what makes it worthless, but its just foolish to believe this. Its nice that people can wipe their ass with fiat or make jewlery out of gold, but this is not what gives these things its monetary value. There is a monetary value that is independent from any other use case. Gold has a monetary premium and would be worth way less, if it wasnt for its monetary properities alone. They should maybe study the properties behind money and then it becomes more clear. Or maybe its just too abstract to get for most people and they keep mixing things up.