How big is the entire portable apps collection?

Which Portable Apps are mutually exclusive? I can think of a few that won't run at the same time, is that what you mean? However, just because you can't run them at the same time doesn't mean you can't install them together, nor does it mean that you can't use one sometimes, and another at other times.
Have you had experiences that indicate otherwise?

[Regarding offensive content: I didn't see your post till after it had been edited, but part of what has always drawn me to PortableApps.com is that people are generally polite and respectful, and that just about everyone types like they know how to speak (i.e. in complete sentences). Let's keep it that way please.]

You don't know his motives. I can think of some good reasons to keep a collection of all Portable Apps on one thumb drive. Thinking again, I also am inclined to collect interesting apps, even if I barely use them...