I agree that owning an AUG seems to be mostly a novelty.
I once had the opportunity to try one out. It felt unbalanced and generally akward. Maybe those things are eventually overcome, but it didn't feel as natural in my hands as the M16/AR15 initially did and still does. I wasn't any more impressed with the AUG mags than good USGI M16 mags and while firing the AUG I experienced a double feed and a failure to eject.
All in all, I don't think the AUG is a bad gun, but I do not consider it to be any better than an AR15 and certainly not worth the extreme difference in price. Add to that the cost and availability of magazines and spare parts and the AR becomes even more favorable.
I think many people confuse price with worth when discussing the AUG. I'm not so sure that it's so much a matter of few people here being able to afford an AUG as it is that most people simply see that there really is little value to be had in buying an AUG at current prices, the extra money buys you virtually nothing over an AR15, and for the cost-conscious the money is far better spent in other manners. If I had money to burn or the AUG cost about the same as a post ban AR15, I would probably own one, but given my own meager 6 digit income and the current cost of AUGs, I don't see myself owning one anytime soon. They are simply not worth 4-5 post ban ARs, 3 pre-ban Colt ARs, a pre-ban FAL and a pre-ban AR, a scoped M1A and a pre-ban AR, or a virtual plethora of other combinations for the same amount of money. If I were to dump that much money into any single gun, it would be towards a full auto or a .50 BMG rifle. If your financial picture or priorities are different, more power to you. I don't think you will be disappointed or poorly served with an AUG, but for those of us who pay a bit more attention to where our hard earned dollars go, at the very least the AR15 equals (and often exceeds, in my hunble opinion) the AUG in performance and without question stands head and shoulders above the it in terms of value and availability of spare parts and magazines.