You are still fantasizing Jono - there is nothing for investors to gain from by increasing supply - if there was they would have done so already; if not here then in those markets which by your standards operate more freely. The supression of supply is what keeps per unit profits up - that's the bottom line, and in a market economy that's all that matters. Just as with the supermarkets, there may be skirmishes around the market share battle ground, but nothing so serious as to dent the bottom line.
For instance - today, in this very publication, a report of a developer with substantial land, with planning permission, and with funding - they did not develop that land because it was not in their individual interest to do so, not because of any blockage.
On your cult/faith belief in individual negotiation power - I take it you have negotiated an individual deal with the utilities such that you are paying a fraction of what us collectivists are, and no doubt you get your petrol at cost - or doesn't it work like that in the real world Jono.