In-form cards are released in packs for a limited time (one week). Once that window is closed, said cards are only available through the auction house.
When a big player like Ronaldo gets an in-form card, users tend to buy an insane amount of packs hoping to find it, thus releasing on the auction house a shit-ton of other cards, dramatically increasing the offer.
Prices go down pretty fast for "normal" (i.e. not the rarest) cards.
Worldwide launch (tomorrow is Europe's turn) and Ronaldo in-form could be a little market-crash.
EDIT: sorry if I'm over-explaining, I don't know how familiar with FUT you are
No that is perfect. Thanks for the explanation.
You still can treat yourself to the IF.
Hahahaha. Damn, any time I have more than 20,000 coins is a miracle. I've never owned and inform card let alone team of the season. My best player is Giovani dos Santos. But he is cool.