Beware of dodgy Gumtree ads

People need to get their brains into the 21st century.

The traffic volumes of sales sites, the anonymity of the internet and the ease of propagation of these type of scams are exactly the reasons scammers gravitate to these sites.
People should be diligent and careful with putting their money and safety on the line.

The OP link was a shocker but if you think about it a logical progression of scam behaviour on the internet. Criminals realise people will put themselves in compromised situations in search of a bargain and will exploit this.

You can't trust anyone on the internet.

This is very sensible advice