I agree that it's all hypothetical. And the mechanism for good connectivity raising prices is not so much that buyer A will offer £1500 more for it, but that buyer A will make an offer at all if he has decided fibre is essential.
Buyer B is happy with ADSL (many are) and is interested in the house. If there is no fibre, he offers £5k under the asking price, is the only qualified purchaser and his offer is accepted. If there is fibre, buyer A also makes an offer and the price could quite easily end up at £5k over without anyone really batting an eyelid - a £10k increase.
To do it properly you'd want to figure out what proportion of purchasers are As and what are Bs, and what steps there were in between. How is that even measured? And data would be needed on the average number of purchasers interested in the average property, and how much multiple interested parties affects the price - data which would likely be outdated as soon as one had collected it as market confidence bounces up and down.
In short, yes it's an imperfect way of tackling the question, and yes, I'd like to see more than just the mean. If I worked for a developer, though, I'd probably give up on quantifying it once I realised that the cost to most major developments of engaging with an altnet is minimal for the potential return.
The meaning to take from that survey, in my humble opinion, is that connectivity concerns in property purchases are mainstream now, not just the preserve of those of us that hang out here.
Edited by ft247 (Thu 29-Apr-21 23:15:57)