You do realise we already have such sats up there right?
GOES for one, but all we get is poor resolution infrared black and white images back, at least the ones we see are, i've already said we have them and the many areas of research that can be done and is being done on the earth from a distance, are you also forgetting they can likley zoom to get any close shots they need?
You ask why they would waste millions when theres countless reasons why they would and already do, honestly i find it odd when i get this sort of response to something that is obviously strange, its like some people really don't like even a hint that something isn't quite right so feel the need to play devils advocate and defend it anyway.
Band with costs? they possibly get more info from the infa-red shots so are using their bandwidth to transmit those, and as for zooming it's cheaper to make a fixed lens with slightly variables then a very adjustable lens.
But instead of saying how suspect it is and asking randoms why don't you email them and ask? if they have any such shots or why they don't take them?
You'll get a right answer then instead of theories we can propose.
Or do you just prefer thinking something is suspect but never confirming it?