+1 on money being the main reason, and shelf life does have a direct correlation. However, I also agree the corking is a likely factor, as I wasn't aware of corking when I first started buying jalapenos at the grocery store, and would bypass pods with it. But shelf life aside, it used to be you couldn't find ripe bell peppers in major grocery stores, either, but they now sell them all the time. I would think the main reason that this transition occurred for bells but not for jalapenos is the corking. Of course, this is just my pondering out loud....