It was possible to build a manabase that would support blue mana nicely (twelve rainbow + three Spirebluff Canal), but black and white had to be ignored a bit in the process
Theres a number of factors responsible, all of them related
However, aside from the switch (or button) itself, this card heavily features a floating Pokeball as its focal point, explaining the card's value
Its used in a lot of decks and hyper rare versions of staple cards like this one tend to do really well on the secondary card market.
At common, cards with exhaust abilities, like Stampeding Scurryfoot and Prowcatcher Specialist, gain significant value in red-green decks
Watching the four-minute video, its clear that Pocket is not interested in capturing the existing players who invest their time in the more serious and competitive Live app