One of the biggest arguments I've seen for bitcoin is the theory that it's a store of value, and it can be valuable in the same sense less liquid financial instruments are useful. Not as a currency to buy bread and beer, but something to put your savings into.

Further, I've heard people emphasise crypto as being useful for things such as smart contracts and dApps. Even with a Lower transaction value, one could still theoretically do some higher value transactions with crypto.

I am not endorsing this argument, but I have heard of it.