Star Wars to me is the entire universe of material out there with a LucasArts/Film/etc attachment. I'm old enough to have seen the movies before the prequels were released and am a big fan of the EU video games and novels as it gave me more than 6 hours based on the original movies of material to get immersed in. And lets be real - the anti EU movement for Star Wars only came about because of the prequel movies and people disavowing themselves from them. That doesn't mean that all of the other material available is bad.
To make some arbitrary line at 'movies only' is hipster, elitist, self-righteous, and anti-geek. If you really think that you are spending too much money, fine, that's a different story, but to try and claim some purism as a reason to stop buying is arbitrary. You're just sequestering yourself, everyone else is going along for the glorious ride.