How Much Space & Bandwidth?

How can a normal user determine the disk storage size and bandwidth that is right for his / her website? Generally speaking, text does not take much space, if any. When it comes to images and videos, it's totally a different story.

How Is The Monthly Fee Calculated?

 How does webhosting service providers calculate their hosting fees? Based on a simple equation: Web Space + Bandwidth = Monthly Fee. How do they make their profits? From overselling their bandwidth and web space.