It really depends, if you're just using your iPod, there really is no point in having the bitrate so high. The file size is bigger and unless you have very expensive headphones that will allow you to hear the difference, there's no point.
I'm not saying there aren't any uses for a higher bitrate, but for the average listener it's not worth it.
On the topic of bit rates what bit rate does Apple Lossless Encoder import at?