Conjecture: a nerd's approval of Airbnb is inversely correlated to their personal experience of living in proximity to apartments that are fully let on Airbnb.

I loved Airbnb when they first launched, and I still love renting people's spare rooms. But once a close friend started having problems with his neighbours, I experienced first hand the negative externalities that were involved in making Airbnb rich. Renting out a spare room now and then is entirely different from dedicated "holiday rentals" in the centre of residential buildings. It is hellish for the other residents.

If PG lived in a standard apartment block and was surrounded by Airbnb rentals, I guarantee he would have a very different opinion of Airbnb.