I bet if you took a poll, well over 90% of smartphone users use their internal memory primarily for A) Apps, and B) Music. With cloud storage and streaming available for the latter, that leaves an option to save quite a bit of money on expandable external storage, or additional internal storage. Clearly the reason they give 2 options is to make more money, it has nothing to do with demand. As I mentioned before, if I could get by with my measly <1gb internal storage on my Evo...I think it's safe to say storage isn't really even a gripe when it comes to our phones. We've all had the "oh crap, I need to delete an app to free up space for a new one" moments, but overall I think it's the least of anyone's worries. As for a difference in battery life, it would be miniscule at best. I applaud Sammy for giving the option, because it simply means more money in their pocket. Oh, and since ICS and beyond seems to introduce the ability to attach external devices, including external storage...the need for a microSD card to be huge is lessened even more (though it would obviously be a hassle to lug around an external drive with you, it would be cool to have for long road trips for easy attachment to listen to your music library).