I think that last issue is more about large scale PV farms, rather than domestic scale ones. With the drastic reduction in feed-in tariff these days, the focus is more on generating for your own use, rather than what you can get for generating it and selling it. Proposed future Wombat burrows generally have enough roof space for a 4kWp system, which typically generates about twice what I currently use a year in my gas heated house. However, I would have to adjust my times of usage to more closely match the generating times, and as I'll be retired, I'll have more freedom to do that. As I'm likely to be moving to an area off the gas grid, I have to think VERY seriously about how I'm going to heat it. I struggle to believe how stupid the current owners of places I'm looking at must be, not bothering to properly insulate their 1970's bungalows, but installing big LPG fired heating systems, and in one case, a bungalow had an LPG boiler, an LPG hob, and an LPG Aga, as well, but only had 100mm of loft insulation, hadn't bothered to get the cavity walls filled, and had retroffited new single glazed timber windows at some point since it was built. It was a lovely home, but instantly needed at least £20k spent on it to make it affordable to live in. Why do people deliberately throw their money away?