If you select 'paid' you'll see exactly none (there were some but they didn't actually work!). Ovi store for n900 is still technically beta. Because technically they haven't worked out how to manage a payment system when people can just come in the back door. So any paid, professional apps are on hold till the Ovi people work out a problem they didn't bargain on.

Case of the right hand not having a clue what the repercussions would be of what the left hand was doing.