This is a good question, especially in light of Nokia Store closing down.

I don't think there are alternatives for commercial distribution of maemo/meego applications at the moment.

Maybe we can investigate how OpenPandora and other niche-y opensource platforms handle their commercial apps, and see if there are reapplications for the maemo/meego platform.

Also, Symbian AppList (sort of an analog to OpenRepos) has commercial applications. However, I believe those are still linked to Nokia Store for the purposes of payment.