Generally speaking, higher disposable income = higher education levels, since education is still the primary driver for income levels. So the concept of smarter people owning Apple products is a path already well-researched and proven.
Here's a recent study.
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Android users are, on average, less educated than Apple users. Not calling out anyone specific, but the whole "Apple users waste money on inferior product" could be 100% true simply because Apple users can afford to do so more than their Android counterparts. The education/intelligence part of of it is open for debate. The fact that more education = more disposable income part, however, is really common knowledge. Well, to the educated people at least.