[Groxx]

It's a sliding scale for priority. More space per watt takes up more space for sun-power farms, and they often cause more heat, making the eco people go nuts, what with migrating geese turning into popcorn chicken above them (</exaggeration>).

For many individuals, who just have roof-space (for instance), space is really at a premium, and increased output means more money saved / made per time period, so it can pay for itself and more over time. Power companies could go either way, as they need a LOT of space. Doubling the area they need may not sound too good to them, as land costs money every year in taxes. If land is cheap enough though, cost per watt likely wins out.