What makes a certain fixture burn through bulbs?
The metal tab in the base of the outlet has been pushed down too far (usually by overtightenig a bulb), and no longer makes good contact with the bulb. This causes sparking that gets worse as it gradually burns away the solder blob, and increases wear on the bulb.

You can tell this is happening be examining the base of the failed bulb; there will be a large divot in it.

To fix it, just pull/pry the tab up a bit. Be careful not to to electrocute yourself.