Most people don't come to public forums for privacy (unless they have something to hide or the goal is to gossip), I get my privacy when the computers off. Public conversations between numerous people are what forums are all about.
Detail City was founded and exists for that people to communicate and learn and the chat box is another tool to do that. If it's worth learning about, it's worth putting in public so that everyone can see rather than a select few.
There are some people that are more comfortable asking things in a "less public" area.
Ya know kind of like when you were in school and were afraid to ask something cuz you didn;t want to ask "a stupid question'.
So you you made a trade off for higher post count. (imho)
If you went to an irc chat room, you could have the best of all worls, since it wouldn't slow down the server as you say and still have a less public area that some feel more comfortable in.
I watch member #'s in forums. If you looked you would see that at most any given time other detail forums are having more members online. We are getting fewer members. Bad trend.
IMHO you decided to sacrifice what your loyal members are telling you to take the board in "new direction".
The question is........ Are you trying to alienate your loyal members for new ones? Because that's what's happening. Problem is the % of new members is going down, while the memberships of other setail boards (including a relatively new one) is going up. (as well as post counts)
Now before you shrug off what I say you need to remember I am a super mod at a board who's current stats are:
Threads: 135,064, Posts: 1,793,942, Members: 227,468
Your members are talking, and you're not listening, or you're listening to the wrong people.
Hope it works out for you.