Although they'd take a lot of flack for it, Apple and Google should really be more liberal with the ban hammer. If it can be proved that you're doing stupid things like this, your dev account should be revoked.
Hard to prove; with strong punishment, there's a risk of "false flag" operations, whereby you start creating accounts to denigrate your own products, so that you can blame a competitor and get them shut down.
couldn't agree more - if not suspended then at least get some kind of penalty - if your ranking is in jeopardy because some marketing dude thing he's clever by paying for 1 star review, then perhaps people will rethink twice their strategy.
And then you have the reverse happen, putting bad reviews on your account linking to competitors.
At least they should delete the offending reviews. But as it stands for now fake reviews (be it positive or negative) stay for months in the app store.