Are you talking about mobile web or mobile apps? I'm only referring to transactions that take place through the web browser.
If you're talking about the mobile web though, fair enough - I find that surprising. It has certainly altered my habits.
When I started work for them I didn't believe so many people were willing to buy via mobile devices. Luckily, so was the competition, whom were not on their game and didnt want to accept such truths... so we ate their lunch. ;)