Not really all that surprised. Now that they're available in more places, more folks are getting to try it.
On the one hand, you can get a Sam Adams with a craft beer flavor and look- that is to say, very hoppy and multi-layered.
Or, you you can get a Yuengling for a much lower retail price, it's got a comfortable, rounded flavor that's not overly hoppy, and just seems like it's more comfortable in it's own skin, so to speak. Eminently drinkable, both for those that can appreciate history and craft, and those that are usually BMC drinkers.
Great session beer for me