Are there actual celebrities who would charge you money if you ask them in person for their autographs? My brother told me it happened to him when he bumped into someone from the Walking Dead. If they do that, then that is the such douchness.
I met Captain Lou Albano, if you don't know who that is he's an old wrestler and he played Mario in the Super Mario bros. movie. I had something for him to sign and he said he'd only do it if I bought a shirt and he'd sign that or pay him 20$. I said I like Luigi better anyway.You clearly answered your own question in your post... but to reiterate, definately.
Personally, i haven't heard of any particular instance or have exp with that but yea that's kind of douchie. Something Beebs would do or Trump.