While most SE sites are able to cater to both professionals and amateurs there is no real amateur equivalent to a systems administrator. This has two effects.

 1. The user base is far more limited and restricted.
 2. We are generally much more discerning and less likely to throw votes about unless they've been earned.

While on a site like SO even a really crappy question can at times get massive votes; that rarely happens on SF. We expect people to perform a level of due diligence that I haven't seen on the other sites I've visited. This is also reflected in our voting.