maybe a couple reasons based around "most" consumer thoughts..
don't really care if it's 16gigs
cheaper to buy a larger sd card (sticker shock 16 vs. 32)
I have the followiing items for sale!
1 Asus M4A88T-V EVO motherboard, c/w AMD Athlon II Processor, ADX450WFK32GM. When Last used, combo was in good working order, mb includes backplate and manuals, cpu has no heatsink. selling as a combo, don't want to spend the time shipping too many...
Touchwiz is horrible. I have a Note3, it's great hardware, but you need a good rom for it. I installed wicked on mine then I just ripped out every piece of bloat I could find. I would suggest reading up at XDA forums for more info.