LOL - yes, it actually would help avoid the white boxer issue. And no, there is nothing more desirable about flashy boxers than classic ones - except that some people prefer the look.
But things are rarely that simple, and there are a whole load of other issues that come into play when you start considering colour as a particular factor in breeding decisions.
Here's a recent thread that gives you a bit of a look at the can of worms that opens, if you're interested:
http://www.boxerworld.com/forums/showthread.php?t=89374