Mountfield1985
Player Valuation: £8m
I think its a combination of people saying "Unlike anything in the PL at the moment" and also the fact that on the docks the wind is far higher than in land, and it may have an effect. Also, the money is in having a multi-purpose stadium, so whilst a normal stadium can have concerts etc, a roof would be massively beneficial for everyone.
Could advertising space on the roof be a big money spinner? Something you could clearly see when flying into John Lennon Airport.