Discouraging resales has always been a strategy. That is why most Vistana resorts are voluntary and MVC resales are not part of Abound.
But if the $3K enrollment fee is true (it is not confirmed), it should not affect your decision to buy resale. In fact, $3K would be considered a "steal" given that in the MVC world enrolling a week requires a purchase of $25K and up and Vistana retros were $10K and up. Grant it you're "purchasing" something for that money, but that "something" has a resale value 80% lower than what you pay ($20K immediate capital loss), so yes - $3000 to enroll a week would be a great bargain.
You can think about it this way... If you buy a WKORV OV for $15K and then pay an extra $3K to enroll it in abound, you basically paid $18K for 6200 points which is less than $3/point. Your purchase still has a resale value of $15K (you lose only the $3K) and the MF/Point are about $0.50. The alternative to acquire points would be paying $5-$6 per point in the resale market for Trust points (or, about $35K for 6200 points), where those points have a $2-$3 resale value (50%-60% capital loss) value and maintenance fees of $0.70/point.
As an "enrollment fee", $3000 is indeed outrageous. But you can also rationalize it in a manner that makes it look like a bargain. It just depends on are you buying a week to use or trade in Vistana (in which case enrolling in Abound doesn't matter) or if you think of it as a way to play with points relatively often.