[coatmatter]

I haven't actually seen "guaranteed to go up in value" pitches but I believe the ones that do work on certain people take a more subtle form.

It's a bit like how poorly written spam makes professional-looking phishing look more convincing to the average person.

The most effective scams are the ones that fool people who think they couldn't have been fooled. Heck, you see it all the time with car advertisements, etc.