Investors and board members would be way more wary of how the company is run if Google decided to do drastic things outside the scope of their core business (like Google Amusement Parks) for superfluous reasons, which would further make them lose money is the stock sinks.

At Google’s size they can invest a lot in R&D and product iterations, but because they are so big the innovation seems way less drastic relative to their size. Put it this way, if I put a new motor, deck, and paint on a small boat, it would seem like I did a lot, whereas if a giant cruise ship did the same thing, it wouldn’t really carry the same impact to outside viewers.