You can never tell. It's certain they will go up towards Easter, as Santa Hats do at Christmas. They'll always be about 7+, in a few years time they would of gone way up on the scale because they'll get rarer and rarer.
Hmm...its hard to say. But if you really think hard, there are only a certain amount of easters left in the game, and no one can just go out and find them. So say you had 7m, and were going to quit for a year...a good investment would be to buy easters, because you know the price can't go down...