I don't think it matter where you advertise - you will still get the ones who do not turn up as arrange, change their minds etc.
I know some don't like Preloved - but have both bought and sold on there, and have met some nice people too - some have kept in touch to let me know how the goats are, when they have kidded etc.
One couple rang up from the Midlands about a milker I had for sale on Preloved. They arrange to come that afternoon - and it was a long journey. They duly arrived, bought the milker and an intact male, and paid me the full asking price.
Myself, I always keep an appointment to view/buy livestock, unless something happens on the day, and then would of course ring up and explain. There is nothing worse that wasting your weekend waiting for would be buyers.