You literally just restated the last thing you said. I repeat: saying art is “good” or not misses the point of art. Either you connected with it or appreciated it in some way, or you didn’t.

I think buying art with the intention of prospecting its future value is commodifying the object. That is a capitalist process which is, at its heart, incongruent with the philosophy of art and creative expression. At that point, the object is no different than any other commodity, so stating that it’s good or bad at being monetarily valuable becomes a more concrete result of its being bought and sold than it’s merit as an artistic work.

To speak of a work’s artistic merit as “good” or not speaks solely to your ability to receive something that the artist communicated. Whether you enjoyed or appreciated that is a valid opinion, but not a concrete fact.