The van Gaal connection to some of the players, especially Robben & Müller, meant that people took it more serious or some believed there's actually a chance of it happening. Don't think it's a thing in general, there are constantly rumours about Bale. Some on the Caf would love to sign Isco more than anything, same happened with Varane in 2014. You have the yearly Ronaldo transfer story and let's not forget the huge Ramos story last summer. I'd argue the Caf is just as 'obsessed' with Real players as with Bayern players, if not more.
Or you could say, whenever there's the slightest hint of a quality player maybe leaving somewhere, the transfer muppets go crazy, no matter the club

.