I'm going to have to disagree with that. I know plenty of people (with money, yes) that want to "get a Mac". There's no mentally independent purchasing decision, it's just what other people have, and they look cool.
As it happens, it's a good choice. But it could easily not be, and they'd still do it.
Notice that they are saying "Windows support" not "Microsoft Support", not knowing that Windows is a product from Microsoft would suggest they are looking for people with a very low level of knowledge.
I'm guessing retired people who have a good pension coming in.
OTOH that must put an upper limit to the amount people are willing to spend to get their computers back from the scammers. If you only paid $300 for a PC from wallmart you won't pay more than that surely.
They do this to avoid being cornered. On one occasion, when screwing with one of the callers, I had a little rage fit accusing them of breaking all kinds of laws. The "manager" informed me that "We never claimed that we were calling from Microsoft, we're calling from Windows Tech Support, which is the name of our company." The agents are very careful not to say they're calling from Microsoft. I suspect that this is some attempt at circumventing exposure to local fraud laws wherever they are based. I'm not saying it will be effective, mind you; just that I suspect that's why.
The target audience is for the non-tech savvy. These people, I imagine, are people who spent very little on a PC/laptop, most-likely running Windows.
So, I wouldn't break it down by who has more money, but by who they are more likely to get money out of.
That's perhaps one of the reasons this scam can be so effective.