The static charge associated with woodworking is predominately created by the friction of the dust and chips moving through the hose/piping of the collection system. The tools themselves don't create a significant amount of static electricity. As Joe mentioned, the environmental conditions play a huge role in the buildup of a static potential.
Keep in mind that it is not the static buildup that causes the problem, it is the arc created by the discharge the would potentially ignite the vapors. All you need is a spark or flame from any source. A pilot light, an electric motor, or light switch could also ignite vapors.
It is probably wise to ensure that your shop is properly ventilated to ensure that vapors don't build up. You can purchase cabinets designed to store materials that can potentially cause issues. While gasoline is a little more volatile, the vapors from finishing products (paints, stains, etc) can be just as dangerous.
While the probability of a fire or explosion is pretty remote, it doesn't hurt to take the steps necessary to minimize the risks.