There aint no way around it, ye always gets what ye pays for!
It'll be a fivers worth of work, most people judge what theyre getting by what theyre paying. Anyone stupid enough to go down that route will soon realise.
He may start at £5 per house, but 6 months down the line he'll be ped off to high heaven that he's not earning £x like us window cleaners with standards, his "standards" will fall even further as he tries to scramble around to make any decent money.
It just wont work, the market has already set the price, any drastic deviation will arise suspicion from anyone with half a brain cell.
You wouldnt by a £10k motor for £2k without wandering WTF!
Just sit back and watch him fail miserably.