While many of us die-hards love sniping an auction on eBay, believe it or not, some people rather pay more to have the card in-hand from a brick & mortar store like GameStop then having KoolPokemonKid42 canceling their $.99 starting auction because the card magically vanished
Possibly better, if you have ways of making tokens during your opponents turns
Spending a marquee planeswalker on the Food mechanic due to color alignment means you have to push so it stands alone if the mechanic whiffs, and the mechanic being in a single set means you have to hit it in one shot, and maybe you have a bad month and miss the +1 ability being miserable
It lets you keep your best creature in play
In Chilling Reign , for example, there are excellent trainers and then there's just a card featuring Agatha peering over her shoulder
Won't your opponent just say the phrase everytime? they said, You're never going to get to draw the two cards. My response: One