I think the fee structure and the community are two separate but interrelated things.
My Dad lives in a CCRC. They initially were only offering units on the type of fee structure you mentioned - a large buy-in (which was mostly refundable within certain limits and timeframes) and a regular monthly fee. Based on popular demand, they started offering the same units with a different fee structure: a $500 deposit and then a higher monthly fee.
I did the math for them and the imputed rate of return (difference in monthly fees divided by buy-in) was about 7%, which seemed good. However, the large buy-in makes it more difficult to move, and at the time my parents were considering this, they weren't entirely sure they'd stay in this place.
The other thing I didn't like and my parents agreed, was that the contractual language about how and when and how much of the deposit we would receive back was very loosy-goosey and gave them wide latitude to shaft my parents.
My parents decided to not do the buy-in when they moved in in 2006. They sold their house about that same time and put that money in the market. I haven't actually checked but I think the money has done better in the market than it would have helped in lowering the fees. And my parents have had the flexibility of moving (which they didn't/haven't done yet, but I think they like the option because they (well he) has brought it up a few times).
One thing to note is that this CCRC has been pretty much full since it opened in 2005 or so, and they've regularly had a solid waiting list. As a consequence of this, they raise the monthly fees (and probably the buy-ins) 3-5% like clockwork every January.