Regarding the title, “Why so many intros?”: you may be aware we have a rule that people do intros; when the forum grew, we decided not to force people to only intro in one mega thread, Introduce Yourself To Members Of The Forum
That was because people often join with questions, but with new replies coming in on the reg as others posted an intro, there was no way for those to grow into proper threaded conversations, so a member suggested making a Category in which people could, if they chose, have a whole Topic for their intro, where members could reply without other intros coming in to dilute the conversation.
(By capitalising Topic and Category, I am using terms specific to Discourse, the platform this forum is on, from whose default FAQ used on this forum by the way comes the concept “Be Agreeable, Even When You Disagree” which has been inaccurately attributed to BALG as proof this is a cult - a small digression, but an important one. You can verify that by checking the software developer’s own forum FAQ, which uses the same text.)
The rest of your post, I ask you, what are your actual questions for us? 
Because if this is just accusations of stuff based on constructs in your mind of what the forum and its members must be, then with respect, tilting at those windmills wastes your time, and ours.
For a bare minimum of addressing the accusations you’ve made, commercial posting isn’t permitted here, on this forum, for example, and many skilled people gives hours of their time every week to help others with no expectation of finsancial gain (something which is true of all internet forums where knowledgeable people gather, regardless of topic, from knitting to pet care to bricklaying).
So… I answered the only real question you asked, “Why so many intros?” - what else have you got? 
Or is this just assumptions, and looking for that one reply you can warp to bolster your existing edifices and straw men?
I hope not. 
Reminder to everyone else, let’s please keep this civil, it’s not very nice to be going about your life, and suddenly have a stranger get in your face accusing you and your friends of all kinds of unpleasant things, but this topic can be Muted, let’s not fuel any silly notions by acting from insecurity, annoyance, or defensiveness. 