The fact that they charge for Drive and not G+ doesn't imply that Drive is more important than G+. Looking at everything they have the last couple of months I would argue it is in fact the other way around. Although longer term and not direct revenue, G+ (and it's ad possibilities) is more valuable to them.
I don't know the exact situation of Google's server warehouse design. But I presume that was developed in-house. Kiva already has other big customers that rely on it for their order fulfillment. Like said in this thread, making your competitors into customers is a smart move.
>Surround yourself with smart people always.
I've been struggling with this one for a while. I've cut time drains and people that keep me down, how to go the next step?