If you're really clueless about Macs then it's a good thing. I actually observed a session take place while I was at the Apple Store...basically someone who is knowledgeable about Macs sits down with you at the genius bar and uses your Mac with you. It really was one-on-one.
But if I didn't know how to use my mac, I'm the type of person to just sit there and figure it out (i.e. browse on the internet finding tutorials e.g. the apple site has a really good one! or I would eventually find discussion forums). Because the Mac is so easy to use that literally anyone can get up and running on the internet.
But hey, not everybody is as adventurous as I am I guess, so I understand that the one-to-one training is something people would like to take advantage of. For the price it isn't bad I guess. But they make tons of money on stuff like that i.e. there's no way the apple guy sitting there with you for a short amount of time cost that much.