Prices were high when the iphone apps came out, then went down quickly and measurably.
In retail and pricing, it is basically IMPOSSIBLE to INCREASE A price but very EASY and rewarding to DECREASE a price to incent customers and gain market share/customers.
I think in a few weeks/month we'll say major drops in pricing for these apps.
I believe they will come down as the install base of iPad units climb. Even the most optimistic estimates have about 500K iPads being sold the first week/weekend. There are already 10's of millions of iPod Touch/iPhones.