Grades like GD+ work in an analogous way, however it usually only makes sense between Near Mint and Excellent, as nobody really cares if a card is LP+ or LP-
Larger shops tend to have better buylist prices than smaller shops, and every large seller has a buylist
There are certainly going to be a few more gems-heck, the entire rest of the set might be amazing, for all we know-but chances are, WotC picked the best eighteen rares in the set to use as Ultimate Box Toppers
You could play Vintage or Vintage Cube on Magic Online, for a cheaper way to try this monstrous format
Multi-Prize Pokmon Management: Cards like V, VMAX, and EX Pokmon give up multiple Prize Cards when knocked out, so managing risk is crucial
1 2 "Japan's 'Pokeman' [sic] Heads West"