Yep, I've also noticed it depends on what your yard is like. This "desert landscaping" thats so popular around here obviously atracts desert animals and these bastards are deffinately desert animals. The bad thing is is that scorpions are one of the few animals that dont clean themselves. So spraying poison is to get rid of them is pretty much useless unless your spraying to kill they're food source.
The good thing is though, besides the temporary pain they are pretty much harmless and cant kill a healthy adult. old persons and babies im not so sure about, but i would assume it would be about the same as a black widow bite