@ bill & trippin: Thank you for raising this point. I make them big so that the user can later scale them down to a smaller size as per his/her needs

. This was also why the
mister cracker images were large in size.
As you know, if you do the reverse -- scale a smaller image up, it suffers from the 'resolution loss syndrome' and looks pixelated, particularly when it's a
bitmap [like jpg, gif, png] and not size-independant
vector artwork.
Read more about this issue
here.
Maybe a user would need a larger version of his/her logo sometime and if it were small to begin with, enlarging it [like I mentioned above] will not produce an acceptable copy...

Particularly in Bill's case, since he usually doesn't specify the size, I assume that he intends to use it in several sizes or try various sizes before he chooses one.
Cheers!