Yes it looks like a duel edge design, but it's not. Laws very by jurisdiction and I don't know where you live, but I'd bet even money that a dual edged weapon is looked at differently than a single edged knife legally in your city/state. Maybe Benchmade doesn't want to get mixed up in any potential legal issues that may arise from providing you with such a knife?
Or, maybe asking to have your knife customized for $5 was just a little presumptuous (one might even say odd) on your part?
"We must respect the other fellow's religion, but only in the sense and to the extent that we respect his theory that his wife is beautiful and his children smart."