I think buying Twickgrid chances for Twickpoints is a really great idea because it will make more people active in twickgrid, there would be more advertisers who will want to buy spots, this way the site will give away more prizes in return so we all get a profit.
My idea is to sell Twickgrid chances for the Twickpoints.
For an example, someone have 1000 Twickpoints and he buy 15 chances for the Twickgrid, now he will have a total of 40 twickgrid chances every day.
Of course there will be a limit for the chances you can have.
Another idea is to rent the chances for less twickpoints.
I say twickpoints in purpose because this is the only way to keep it fair (so the ones who can't afford investing money will still be able to use this feature)
Hope my idea will be applied soon ;-)