[quote=Yog Sothoth]
just the same as the Namekian dragon balls being all together when they needed it and the dragon being more powerful. 
[/quote]

Except they were gathered together intentionally by Frieza before he realized he needed a password and he wiped out all but three Namekians on the planet, and the dragon being more powerful made sense because that was the original set of dragonballs and the ones on earth are just derived and thus weren't meant to be more powerful.

:I