Those most vulnerable to pitches are least able to afford it - the old, the isolated, the easily intimidated, the mentally unaware, etc.

Yep. Same deal with junk mail marketing (I won't say "direct mail" in general, because a lot of that is actually targeted at people who can afford to spend and have demonstrated that), email spam (same caveat as previous), the Home Shopping Network and all those commercials and infomercials for hilarious shit that go up on YouTube.

Whenever you think "Jesus, who would buy this?" that's who.