The MSRP on Kinect games isn't officially set, but most retailers have them listed at the standard game price of $59.99 US, which is high for most of the initial titles.
Kinectimals would be comparable to Eye Pet, which retails for $39.99. Other Move game collections are also priced at $39.99. Many of the Wii series game collections are $39.99 as well.
It just seems excessive to be charging $59.99 for Kinect Adventures, Kinect Sports, and even Kinect Joy Ride, which was at one time going to be a free XBL title (http://current.com/entertainment/gaming/90142121_microsoft-game-studios-announces-joy-ride.htm)
I don't think there's any excuse to be made for MS here, but naturally they are entitled to charge whatever they think consumers will pay under the assumption that consumer interest will be high enough to pay any price within reason upon initial release.
Personally, I don't think any of the initial titles are worth full retail $59.99 price, but Joe Public consumer's opinion matters more.
