Earlier quoted context omitted.
and what language/platform, hosting costs, etc...
It's PHP, for what it's worth. I know because the first thing I do at any site is look at their error handling. Here's theirs, trying to load http://freescreencast.com/screencasts2 : Missing controller You are seeing this error because controller Screencasts2Controller could not be found. Notice: If you want to customize this error message, create app/views/errors/missing_controller.thtml. Fatal: Create the class bel…
Yes, its a matter of changing the debug value to 0 instead of 1 in /app/config/core.php. If this were set you'd be getting 404's instead of error messages.
@OP - This probably isn't the best place to sell your site, but you're going to need a lot more stats if you want to sell it anywhere. At the very least you need to show proof of revenue over time. A good place to start your asking price is 8 * monthly_profit.