In real life applications, increasing caster does several things. First, as already stated, it increases camber gain, that is, added camber through steering. Think of those choppers with really long front forks. When the bar is turned, the wheel sits practically sideways - big camber gain.
Second, it increases road feel and allows the tires to center themselves more naturally. In this case, think of a shopping cart from the grocery store. Those wheels that sit well behind their pivot point makes it so that if you give it a nudge through a turn and immediately let go, it will almost automatically recenter itself. Both of these positives come at the expensive of additional steering resistance.