I think you should read this forum's
FAQ - MVC DESTINATIONS Points Program even if only to clarify the certain terms that should be used when talking about Marriott timeshares. You're right, it's all very confusing, and I'm sure that the focus of any sales reps with whom you speak is on whatever will get you to buy DC Points. That's okay, that's their job!, but it seems that with you they're not at all helping you with understanding all of the options.
Enrollment applies ONLY to Owned Weeks. Currently only the Weeks being internally resold by Marriott Resales Operations are eligible but then only if Points are also purchased within twelve months of the Week being purchased. In that hybrid sale situation the enrollment fee for the Week is generally waived, or, if the Points are purchased subsequently, credited at the time of Points purchase. For anyone who currently owns Weeks that are eligible for enrollment, the fee is $2,395. and has been since Jun '12.
I don't believe that the hybrid/enrollment option is available if you purchase a Week through Marriott Resales Operations and DC Points on the external resale market. But it does seem like the reps with whom you're talking are referencing the various per/BI fees which are incurred when purchasing Points on the external markets. Here on TUG you've asked questions about practically every type of purchase that can be made so it's hard to say whether the reps are being deliberately obtuse, intending to further confuse you, or if they're truly as confused as they appear. Neither would be surprising, but no doubt it's not helping you at all. I'm sure that we can help you sort all of this out but it's going to take some time and your Thinking Cap. Please don't get discouraged!
As for the supposed recent increase in (what I'm assuming is) the Initiation Fee for externally-resold DC Points, yours is the first report we're getting of that. I wouldn't take one sales reps' word for it but am interested enough to dig a little further to see if there's at all a kernel of truth in it.
The governing documents do allow for limited usage of resold Trust Points, but as yet we haven't learned of any instances where they've imposed any of those limitations. If the various fees are paid at closing, full usage rights are being granted with such Points.
*I hope you don't mind that I'm merging this with your other thread. It will help us, and should help you, to keep all of your questions in the same discussion until we've all fleshed out the particulars you need.