I suspect that the categories themselves are fluid. They represent whatever random users want them to stand for. Because this is a first attempt at organizing categories, some tags will inevitably be misgrouped.

As you point out (1 & 2),

(1) Some people are more into content creation

(2) Some people hope to use Steemit to market their existing content

(3) There are also people out to make a quick buck by either reposting other people's content without adding anything or (worse) passing it off as their own.

I hope these supercategories will be of use to the first two groups. The third group amount to internet roaches: as long as we frequently switch the lights on and do regular housekeeping, roaches tend to stay away.

Reasons for my grouping into A, B or C:

my judgement (based on decades spent in dusty libraries) of relatedness: just a rough guide.

A: finance, economy and money are somewhat abstract (of course, money has many different meanings, but I'm not trying to produce an intellectually rigorous analysis)

B: gold and silver are sometimes considered forms of investing / investment. Betting doesn't fit very well, but at a stretch some people consider it to be a form of "investment" (after all, isn't investing in the stock market a form of gambling?)

C: market, marketing, business and trading are all related.

My main purpose is to make newbies (and even some experienced users) aware of categories they might have overlooked: a mental map of Steemit space, if you will.

Based on the comments I receive, I hope to improve this series of posts every half year (or maybe more often). One thing I will definitely do is to add external connections. The “Mikes and Cameras” supercategory (currently in a draft stage) should also have a link to the “Entertainment” suoercategory, for example.