The old adage, "...you can never have enough clamps", is true to a certain extent. The problem is, that, there are so many different types of clamps, intended for specific purposes, that it is virtually impossible to have the "best" clamp at all times. I think, that, the average hobbies has a basic variety of clamps like those originally listed. However, there are many more useful types that the average person just doesn't have. Some are better for the intended purpose, but if you don't have them you make do. It doesn't mean that the job doesn't get done properly.
As I stated, earlier, I don't use "C" clamps except on rare occasions. I've had bad experiences with them in the past (mostly due to my own fault(s)) and I prefer not to use them. I find other ways to do the job. Doesn't mean, that, they aren't useful.
Chuck is right, the list is only the start. I'm sure that all of us have at least one band clamp (and ratchet straps...very useful..), a variety of spring clamps, etc. in the shop. Do we use them on a regular basis, probably not, but I wouldn't be without some of them.