There are many different reasons why people choose to stay in concierge. For some, not having to be on hold at 6:55am for those hard to get CRT ps's, is justification enough. There are those vacationers that use the concierge pre-planners for much more than just ps's. They can help to set up magical private dining experiences with family and/or friends. Just check out any of the trip reports made by Janet2k to see what I mean.
For us, we truly enjoy spending a lot of time at the resort, therefore we get plenty of use out of the concierge lounge. We are not big breakfast eaters, so a bowl of cereal, some fruit and bagels is perfect for us to start the day. AKL offers a special sunrise or sunset safari to their concierge guests and many will tell you that's it's very worthwhile to them. I believe most of the concierge resorts also offer a private check in service, where you are met by a greeter and escorted either to the lounge, or even straight to your room. Not a big deal for everyone, but a nice feature. I enjoy personal service and I like it when I'm greeted by name. It's just a level of service that some people are willing to pay extra for. As far as justifying the cost though, it's all a matter of personal opinion.
HTH,
Tammi