This is because grading removes the guesswork, assuring a buyer of the card's pristine condition
Increasing your speed has no effect on whether another player has speed.
However, some of them have useful abilities that make this unfortunate drawback worth working around, and one of these strategic options is Cradily
Devastation Tide, is similar to other mass bounce spells, but the potential to cost a mere and touch lots of permanents is super valuable for removal
This part of the mane would probably look better if it were fluffier
So, while $150 for an experience is vastly less than one would pay if playing real competitive Magic, its still quite a lot compared to a random board game, where $150 is going to get you a massive box of plastic figures for some 6-hour epic space game, plus a new deck-building game, plus some old Silverline game from FFG