I mean to be fair you do normally make a profit on houses even if you’re not mortgage free. If you buy a house for £100k, spend £5k on it and sell it for £110k you’ve made £5k profit even if you always had a mortgage on it
Yes, exactly. My house has increased in value by £70k since I bought it, plus I've been paying off the mortgage. I'd have about £100k if I sold up and paid back the mortgage amount. £30k of that is just the money I have already paid back, but even taking off the interest on my payments to date, that is a profit!
As they make money flipping, their deposits for the next and the next will get bigger until eventually they are cash buyers.