What is the purpose of the big and tiny mushrooms?

Question

I am playing in diamond and the description is "It is quite/very popular among certain maniacal fan segments". I dont get it...

Answer 1

You can sell them at certain Poke Marts for a high price.
Tiny Mushroom = 250
Big Mushroom = 2500

Comments

You Can Sell Them In Poke'marts And In B/W You Can Sell Them 2 A Mushroom Collector
On Route 5.
![][1]

***(:P***
  [1]: http://img.pokemondb.net/sprites/heartgold-soulsilver/normal/mew.png

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What mushroom collector? I have never heard of a mushroom collector in diamond.

Answer 2

Their only purpose is to be sold.