is YFI itself really worth to invest? In my opinion, they are just capitalizing also with FOMO as checking their site -
https://yearn.finance/earn it says they are still in beta. So what added value are they offering to the community right now why they are very expensive in the first place? So you also need to be careful with this YFI project itself because they have no solid foundation why they are having that kind of price.
They were smart enough to set their supply to way fewer coins than most cryptos, and that attracted a lot of attention from everyone. If you were to multiply the 30k supply by 700 times (to get to BTC's max supply) and then divide the current price (~$29k) by 700, at Bitcoin's supply it'd be worth $41.5 right now. It's a very very vague calculus but I'm only considering the supply & price/coin.
In other words, it may be more expensive than Bitcoin but do people really not care about anything else besides price at this point?