I have to say I'm also super annoyed by these samples. For the longest time I didn't turn on wifi on my Nook Touch. I kept checking my online account to see if anything appeared and wifi has been of a lot over the last few months on my Nook 1 and Nook Color.
Last week I checked my online account, nothing there, then I turned on the wifi on my Touch. All of a sudden the sample books end up on both my Touch and my online account.
So...I guess the morale of this story is that I can never turn my wifi on again (on the Touch). *sigh* I always side load my books anyway so that won't be a problem...but I shouldn't be forced to side load all of my purchased books.