Gets rid of stock LA's don't want to bother maintaining any longer.
When i bought mine (yes, yes I know im such a steaming cunt! But do tell me where else I was buying a 2bed semi for 48k please?)... I had lived in it 10 years.
It needed a new kitchen, bathroom, insulation, half the windows doing, the heating system ripping out and starting again, the electrics were dodgy as fuck and each job we did revealed 20 more (peel some wallpaper... all the plaster falls off. Lift a floorboard, find the rest are rotten as are some of the joists... etcetc).
I'd been a good tenant - rent on time, repairs reported, nothing needing repair beyond usual wear and tear - but what I bought was a property that had been built with all the corners cut (And none square), that had then had 30 years of abuse and bodge repairs courtesy of the councils repair contractors.
I did those jobs, I rented it out when I had to leave the area and I sold it on paper for 12k ish profit, only when you take into account the work done in the years I owned it, no profit at all really!
Do ya think the LA put the sale price back into more affordable housing? I don't, though that is what they are supposed to do. They had first dibs to buy it back at market rate, didn't want it, they never do.
So yes, it might be a stupid scheme and it might be horribly unfair on those who never got their foot on that particular ladder.
However the RTB scheme is the only reason I am home owner (my current property was bought via RTB, sold to my sister then to me) and in terms of housing costs saved ot the LA, I can't even begin to count it. If they STILL had a duty to house me, I'd be costing them THOUSANDS a week now - and if I'd stayed a council tenant, they would have and now, I am disabled.