No it does not matter how many files you share it will make no difference in your search results or DL speed. What it does do though is make it easier and faster for others to get the files. The more sources the greater the availability for sources and bandwidth. The files on the Gnutella net are not stored on server computers they are saved and shared from individual's computers like your's and mine.
Unlike
milkman6453 who just takes and does not return. He is what is know as a (
LEACH)he takes but gives nothing in return.
And he is a pretty ballsy leach who wants other to help him and if they don't he gets pissy about it.
As far as I am concerned and probably most of the people that share are concerned on the Gnutella net he can try and figure it out for himself.
Good Luck