If the plan is to get the diverse iput that you currently have then I would say you shouldn't go to a pay to read or submit type of site. That would limit it to a very specific group and would probably keep out the new pond type of reader from making any contributions or asking the good questions that many take for granted over the years.
I would say that the best way would be to have banners and like everyone else ( NO POP-UPS )
You could also do something like have a standard site like this and a pay for consulting site that would allow for access to those with specific detailed questions that you should get consulting fees for as well. If you did that it would be an extension and growth opportunity for the pond consulting business.
Well thats my 2 cents ( only wish I could deposit them directly here for you )
