The feeling is immeasurable. The uncertainty of rewards is why splinterlands' is addictive, there's no certainty to anything, and this takes away the boredom of knowing it all.
I think the same can be said about lootboxes. I think it is inherent to human nature trying to find excitement in unknown odds, that is why gambling is so widespread as well. Atleast in Splinterlands it is an investment as well!
Good blog!