It depends what the £99 is for. No Pre-vac, and traffic lanes only, then £99 is very reasonable for an average 3 bedroom house with no bad stains (3 bedrooms, HSL, Lounge). Its all the ifs and buts which make it a risky sales strategy. But then again better to make money than sit it the house waiting for the phone to ring.
Same with the £45 flat. I imagine, from experience, two bedrooms (one being a box room), lounge and small hall. Same standard of cleaning. Hes in and out in an hour and the customer is happy. He probably making more than some of us.
Not the way I sell my business but thats the whole point. Selling is a story and its depends on the way you tell it to the customer.
Mark