While I don't think sampling itself is bad, I know i will limit myself to one or two, even if there are more than that I think I might like to try. There's an ice cream place near my office, and I bought a groupon for it. It's homemade, and they have a bunch of unusual flavors. while there were a whole bunch I was curious about, I only asked for samples of two, the couple times I went. And I did end up buying.
Slightly OT: I caught a few minutes of "Extreme Cheapskates" the other night, and one guy went for fro yo, took 14 samples, and unashamed, walked away without buying. that was his ploy all along; take the samples so its all free. His wife was mortified and I woudln't be surprised if he was banned or the owner limited how many samples one could try, after that. So while the OP didn't do this, it IS the intention of some people.