I think for at least some of the people who bid for these expensive cards, it's more about regaining a lost part of their childhood than it is about snagging a card they can hopefully sell in a few years for a profit
If there's a cost associated with having it attack, its controller isn't forced to pay that cost, so it doesn't have to attack in that case either
Gemstone Caverns #51 (Galaxy Foil) Market Price: $499.98 The award for most valuable Stellar Sights card goes to Gemstone Caverns #51 in its Galaxy Foil treatment
In addition, the landfall trigger effects all Birds you control rather than just itself, like most Chocobos
Magic: The Gathering Zendikar Rising will be the next set released into Standard, and sees the game return to one of its most popular locations ever in Zendikar
One $5.99 listing for a Starmie ex, for example, asks buyers to ensure they have 500 Trade Tokens, one Trade Stamina, and most importantly, an "unwanted Pokmon ex" to exchange for the card they actually want