+1 to bhoese's suggestions here: surely it would make multi-accounting far less attractive if the number of RRs was increased dramatically before a multi can get to the point of playing for substantial stakes.
And Shoe, I do think you should allocate some focus on the Hack tier. I can understand your reasoning not to, but this is exactly the place where new converts to the site are likely to get most disillusioned, seeing scores that they don't have a hope of posting themselves. From a business perspective, you need to encourage your genuine new players to persist and improve, rather than feel they'll never have a chance to compete in events.
And I agree with fmagnets' points as well: the marketing dept. promoting the scores of players with patently dubious histories undermines the credibility of WGT and the faith of loyal, honest players. Surely it's worth even a cursory look at the players before you craft these news releases?
However, I do want to point out that WGT does act on concerns about multis.
The two players noted in this other thread (and mentioned here also), were 'promoted' by WGT to TL tier (perhaps where they'd originated from... ?) on 7/9 (as was another frequently noted player), right after concerns about their legitimacy had been raised here in the forums, and complaints had been forwarded.
Where WGT seems to make its own job harder is by making it challenging to tell if any action has been taken. Those players remain showing on the leaderboards in question. Does their 'promotion' mean it's certain that they won't get prizes from the Legend tourney when the event is validated? Or, as it appears on the surface, are they allowed to transgress once, but get bumped up so they can't do it again? How is that supposed to make legitimate players feel? And should legitimate players carry on grinding to try and beat scores that don't really belong in their tier?
There seem to be categories of accounts that have had action taken on them. A forum tip I've seen in the past is to search the Find Players mechanism, and if someone doesn't come up, it means the player's account is suspended. And then there's this other level where they get bumped up (to the tier where they belong), but without any apparent penalty for attempting to cheat the system and other players.
Surely more transparency around this whole process would be helpful...