In all fairness, they are giving you like 10-15 games (all online enabled) for a fair price. THere is also the fact that some folks aren't going to care for a certain suite of games, and those who basically want it for one or two of the games (a texas hold-em addict or a Go junkie for example).
I think its a great package, and if the GBA renditions were any indication, these will be a very well produced series.
Ah, and yes the online aspect is a bit of a killer app, seeing that it may be the first online DS game, and the games themselves are pretty universally loved and enjoyed.