It seems like the focus is on casual usage (photos, videos, etc). Why not focus more on the business side (i.e. numbers)?
Quote from PG:
"Don't be discouraged if what you produce initially is something other people dismiss as a toy. In fact, that's a good sign. That's probably why everyone else has been overlooking the idea. The first microcomputers were dismissed as toys. And the first planes, and the first cars. At this point, when someone comes to us with something that users like but that we could envision forum trolls dismissing as a toy, it makes us especially likely to invest."
On the other hand, casual users aren't a natural fit for excel. The program has way too many complicated features, and isn't as simple as it could be. This seems perfect for the casual user that just want to create simple stuff that looks good.