The value of art, sometimes, cannot be comprehended.
It's the same with some NFTs with the same value this banana has

The value is whether the buyers agree on the selling price hehehehe. If the price is very high for them, this implies that the demand will go down and the sellers will be very much need to lower the selling price. This is very much similar to the beginning of much of the cryptocoins in the cryptospace. If we are being honest with ourselves this included bitcoin during the very beginning of bitcoin's creation.
This banana on the wall, if there is 6 million bananas taped on the wall, will someone pay $6 million each for this? No because this is showing that this is stupid hehehehe.