I think you didn't get pooya87.
Pooya87 is saying that you shouldn't look at bitcoin as an investment. You should look at bitcoin as a decentralized payment system.

Satoshi didn't create bitcoin to make people rich. Bitcoin has been created to give you full control over your money. Bitcoin has been created to not allow governments and central banks steal your money using their printers.

I recommend you to compare fiat with bitcoin. Which one do you prefer? A centralized currency or a decentralized one? Do you want to have full control over your money?

I myself prefer bitcoin over fiat. (No need to mention I have to use fiat as well.)

Bitcoin value against fiat may increase over time. But that's not guaranteed specifically in the short-term . If that happens, I consider it as a reward for the trust to a decentralized currency.