For a little "walking around money". But I imagine it's for liquidity's sake. Why would he think that the thing he has the most control in would stop being the

For a little "walking around money". But I imagine it's for liquidity's sake. Why would he think that the thing he has the most control in would stop being the best thing to invest in? It's like someone who owns a bagel shop selling some shares to own part of a coffee shop down the way. Unless there are things out of Google's control that are coming, which might change the valuation. Or more importantly, impact their profit potential/share value increase potential?