The very similar prices of GOOG vs GOOGL kind of contradicts your assertion that the voting rights of shares are particularly valuable.
I think a lot of investors are largely ignorant of the voting fact and I also think, most don't get involved until things go badly; so, we'll see how the long term plays out to really know.
I wonder if there are any other companies with stock structures similar to Google but without all powerful founders that would provide more data on this question? I don't know of any off the top of my head but my knowledge in this area isn't particularly strong.
> Many companies list dual-class shares. Ford's dual-class stock structure, for instance, allows the Ford family to control 40% of shareholder voting power with only about 4% of the total equity in the company. Berkshire Hathaway Inc., which has Warren Buffett as a majority shareholder, offers a B share with 1/30th the interest of its A-class shares, but 1/200th of the voting power. Echostar Communications demonstrates the extreme power that can be had through dual-class shares: founder and CEO Charlie Ergen has about 5% of the company's stock, but his super-voting class-A shares give him a whopping 90% of the vote. [1]
[1]: http://www.investopedia.com/articles/fundamental/04/092204.a...