I've had worse where the rules were you were only allowed to get one autograph per guest. Literally everyone thought it was a bullshit rule including the guests but we all had to abide, though some did let slip a few quick seconds here and there.
I totally get not wanting to hold up lines but that years was especially ridiculous. Luckily it seems they lifted that rule, although they seemed to have replaced it with not allowing any photos to be taken of the guests. Was at a con last year and wanted to get a photo of Josh Grelle (before he went exceptional) with a specific item just for something funny but he revealed that the con staff forbade him and the others from doing photos.