That is only a problem if you assume that the votes of the informed make a difference at all.
If, like many politicians, all you do is repeat "more people should vote" like a mantra, again and again, then the point is being missed anyway, and buffet lunches would send polling numbers skyrocketing. If the only concern is the numbers, it's a good strategy.
If the problem is that fewer and fewer people are willing to subject themselves to any involvement with the political process as a whole due to its farcical nature, then we just need a whole new political system. That should be pretty simple.
I agree that the politicians are missing the point. I agree that buffet lunches would likely cause polling numbers to skyrocket. I agree that the political process, as currently practiced, is farcical in nature. I agree that we need a whole new political system.
I don't think we really need to further compound the problems we currently have in the meantime.