Take a look at the precursor and probably the inspiration for the Meld cards, the BFM
Depending on your deck, discarding a particular card may also allow you to activate that cards effect and kickstart a combo of your own
You can triple Gamble for five base mana, but you can shave off a mana to let a foe discard and draw cards in a reverse looting effect (rummaging)
The relationship between total population, gem rate, and market value is nuanced and specific to each card, and the collectors who take the time to understand those relationships are the ones who make the best decisions about what to buy, what to submit, and what to hold
I have a few top chase PSA 10s on my list (that alt art Gengar VMAX from Fusion Strike will be mine this year), and will focus primarily on Scarlet and Violet and older PSA 10s