It would be interesting to see how much exactly the state is spending every year between hap, ras, direct leasing properties for 10/15/25 year terms, grants to threshold, simon, focus, mcverry trust, & the rest of the 26 homeless charities, plus the funding or grants given to the 520 ahb's like cluid, tuath, respond etc. Then add in the new developers subsidy. Plus the amounts being spent on buying units under part5 and councils buying additional housing in private developments, and one-off's properties being sold on the open market.
Sounds like a lot but maybe it's typical of how social housing is managed everywhere now. Comparisons with other EU countries and our nearest neighbour, and how they do things, would also be interesting. Maybe they have a better handle on it, ours seems completely messed up.