I would say yes, nearly everyone does this*. I think there's definitely an advantage to it (how could it not be?), but wether it's particularly signficant or not.. who knows.
* "This" being "buy the card which gives the least information", which, as you point out, is Silver most of the time, but not always.
Edit to above: Chapel is one of those things where you tend to buy Chapel first, because it's the "obvious" buy, and the second buy might be the less obvious. But clearly the general principle is at work there, at least.