That certainly isn't anything, especially if a more formidable creature mutates atop it or, goodness forbid, one picks two of them from the card pool
Multiple Pages of Coloring will give hours worth of fun
Not all shiny or holographic cards are worth a lot, and some of the most valuable cards dont look flashy at all
Similar to the Pokmon, the most playable supporters printed in full art or alternate art variants often end up being very expensive
Variables: N is about 3.5 from my observations, and that already accounts for the fact you pick some Mythics, so no further adjustment needed there
Maybe just to play with their friends and family, to collect themselves, or to resell on the second-hand market, fans are just going crazy for the resurgence of Pokmon TCG