I hypothesize Google pays for these images, and they are more likely to pay for recent high-res (i.e. more expensive) metropolitan images because there is greater demand (primarily from Google Maps rather than Google Earth). That's why your images are low-res and old. I'm pretty sure Google doesn't own any satellites. It's very expensive to deploy a satellite, and several companies have gone bankrupt with satellite-based products (Iridium is the most notable one, Sirius/XM may soon join the club). If such companies don't recover their costs, they will tank.
I would suggest that you make a case with Digital Globe to see if they will donate images in exchange for some kind of co-promotion. Such as, If you find the downed plane, you will say Digital Globe helped. It's worth a shot.
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