Ya know I found it best after a let down to reset and focus on what I like and what I can afford. Though occasionally I go outside this idea, hence the reset.
If you buy what you like and what you find attractive you'll be less likely to get disappointed and if you're stuck with the marble then at least you like it.
I have cat eyes I bought in 1977 because I wanted them real bad and I still have them and some other marbles, long before I knew any had value.
Marble on my friend,