This is a great thread. I learn a great deal from these forums. I'm new in caray (very new to HBD, too), and I came in picking up a team that appears to have been used, abused, and abandoned. I had to sign about 15 minor league fas just to have minimum rosters. I like the league, and didn't receive any predatory offers upon joining. (In another league, I received many, mostly in my first month, mostly from just a couple of owners.)
To my eye, the problem is only 50% noob related. MikeT said there are two choices: quit, or teach the noobs. I agree. And to me, teach the noobs is the answer, for the health of leagues and of HBD in general. Of course, there are some who don't want to learn, and that's a problem. To those who want to learn, the forums or gold. It's still a steep curve. Mentors or partners will help a lot. But I believe a lot of people seeking what HBD has don't really want a mentor. They are competitive and wanting to show they are smart, and (to my eye) they simply don't know enough to know they really NEED a mentor. They won't know that for a while.
I think requiring new owners to post and discuss trades for a season or two is a good idea. It creates conversation, it allows for a new owner to see how other owners evaluate players, and it discourages the bad actors who send the classic raft-of-**** for one gem deals.