I bought the D800 for Landscapes, Videos, and Events. I use all 36 MegaPixels pretty often. We also use a D600 for Events and I will nearly match that image and file size by setting the D800 to shoot Medium JPEGs.
As for web space. We shot way less pictures at our last Event (only 1647) and it still took up 17.5 GB on my computer. I had one Event last year that used 211 GB. Can you imagine how much that would cost on your "Web Hotels"? With Photo Shoots and sales down, this is probably more than I gross in one years photo sales.