You can't expect to make much money on the Mac App Store with an app priced at $2 in a niche category. You'll never get the volume of downloads necessary to be profitable, unlike on iOS, whose market is many times larger than the Mac.

My Mac App Store experience has been rather different. I have several applications in the store ranging from $5-$20, and daily revenue is usually in the $100-$200 range. The Mac App Store has brought much greater exposure and increased sales.

To generate income on the Mac App Store, you really need to be aiming for products that can be sold in the $20 range if your product is in one of the smaller categories.