lol. Yeah ive heard that a few times. and there is all sorts of reasons.
If you are after just a decent unit for GPS then there are plenty of other choices. The Axiom is a fine system for that use. similar processing power etc. where the Pro steps up is in build quality and sonar performance. That old saying is true with marine electronics, you do get what you pay for "especially with build quality" but there is nothing wrong with any of the price spectrum. the new lowrance HOOK 2 or Garmin striker Pro are both fine and groovy units. they are designed to be a certain level to mantain a certain price point. the Axiom pro "like the new NSO EVO3 from simrad" are designed to be higher up on the food chain. "new NSO EVO3 24 Is $17000"
Hope that helps somewhat.