It's got southern Germany and the bulk of non-Alpine Switzerland and Austria. On the other hand, it lacks Rhône-Alpes, PACA, Piemonte, Lombardia, Veneto, FVG and Slovenia. And, oh irony, the only swiss cantons not comprised in it are the most alpine ones. This region definitely cannot legitimately be called "alps" under any meaningful definition.
Fine, fine. Nit picking, nit picking. What do you suppouse I call an area consisting of Austria + Switzerland + Southern Baveria + Southern Baden-Würtenberg + South Tyrol and some other very northern parts of Italy + Lichtenstein. Auswisobasobawürsotyrstein?
As for the question: I don't know if there's a special reason, but summer and winter tourism might have a lot to do with it. It's a job magnet. Switzerland of course can be explained partly because of the historic Protestant hard-work ethic.
I considered that, but other tourist regions are no different than Europe at large. Looking at Andalucia and the French Riviera, quite the difference. As for Protestant hard work ethic shouldn't that then also apply to Scandinavia. (I mean obviously Norway... but the rest of us?)