Something not considered...
Something no one has mentioned is that when out shopping, 99% of folks have their cell on them, not a tablet or PC. So, if a person wants to compare prices, they aren't going to go home and look it up or whip out a tablet, they are going to use their cell.
While I have made purchases on my cell, most of the time when I use it to "shop", I'm just comparing prices or checking availability. As MagicMoment pointed out, most sites don't work well on small phone screens. There have been many times when I'm out that I will whip out my cell to make sure a certain store has an item in stock before I drive over there.
Cell phones do drive business, just in a "soft" way not a "hard" way that is easy to track.
