Bad Ignition Switch?

I have an 89 Bronco with the 351W. Within the last 4 months I have gone through 3 Ignition switches. The last went bad after only two starts. Switches work in all positions, except for the final position that cranks the engine. i simply get nothing when i engage the switch all of the way. The truck can be started by crossing the solenoid. Am I just getting faulty switches from the auto parts store, or is this another problem? I took apart a switch and it seems to be only a mechanical part , so I don't believe it could be fried. Does this sound right? I would appreciate any help.

Did you check the accuator rod on top of the column?

First tilt or no tilt ? If it is tilt there is a pot metal "D" shaped acctuator slide that is prone to breaking, it engages in a slot on the end of the ign. acctuator rod. Also, if the upper section of your tilt column is loose it will cause the start position not to work. the best thing to do is disassemble the column to the tilt pivot.