Let me set everything straight on this one. As one of the things I do for a living as a mechanic, I know a bit about alignments.
First off, there are 3 different measurments toe, camber, and caster. on a stock Honda, the only factory adjustment is toe. If you were looking
straight down on your car from the air your toe would be the left to right angle of the tires like this / \ or this \ /. It will affect tire wear, pulling, and other things.
Camber, which usually doesn't come into effect until you lower your car, is the inward/outward tilt of your tires when viewed from the
front. Negative camber will make your tires tilt inward when looked at from the front like this / \, and positive camber \ /.
Caster is the angle front to back that your wheel/shock is when viewed from the
side of your car. It can be seen as / or \ type of an angle and can also be seen more easily by having more space to the front or the rear of your wheel/tire in the wheelwell. This is the least critical of the 3 adjustments. With our cars expecially, it rarely causes a pull unless extremely out, and also has no effect on tire wear.
Camber and Caster can both be adjusted with the addition of specialty parts that modify the control arms, ball joints, or other combinations.
So, to answer your original question, unless you're having a problem with the handling of your car such as a pull after having the alignment, you probably don't need to worry about the caster being out. Unless you have some extra money burning a hole in your pocket and it really bothers you that much