I watch it now and then. But more then than now!
Most of the auction purchasers are professional buyers, been doing it for years, and flipping.
Most of the buyers have a stable of trades at their beck and call, for a cash, mates rates, etc. cost including the fixtures and fittings from connected suppliers.
They can buy multiple properties and do them up in rotation.
No one ever mentions the fact that if a buyer flips and makes a profit, there is a whack of CGT charged, plus legal etc.
Some if not many are buying as companies set up to buy and flip.
It can be addictive to watch, as many will say "I could do that!" but the reality for an individual buying one property for flipping, with no trade or other connections is that it's not as easy as it looks.
I agree that hoovering up such properties is problematic, but the fault lies with Government policy. If a property is flipped within say three months 40% CGT could apply to the gain, or even more, and a punitive Stamp Duty too for investors too. But then who would buy derelict properties to supply the rental market?