That's a long (sad) story.
The short answer is that Edaville *was* a great place and well managed for many years. However, it came under poor management and eventually went bankrupt. The collection was sold at auction.
The majority of the historic Maine equipment (including #3, #4, & #8 - #7 came later) was purchased by Phineas Sprague who started the MNG railroad and museum.
(This is a greatly simplified version of the events, and I'm intentionally leaving out the politics, blame, etc.)
The current Edaville has no real connection to the prior management. They are doing a good job with what they have, but it is not the place it was back in the 1970-1980's.