Normally this feature will be a plugin
ZandraJoi What is the real money cost to have it set up?
In certain software, almost nothing. Some paid software offer these extensions as a Premium Package. Even then, setting up is still free, unless you are hiring someone to do it.
ZandraJoi it increases post count on your forum?
People like rewards, badges, titles. So yes, it might help.
ZandraJoi Do you need special skills to handle this feature?
Depends a lot on how this feature is added to the software. Most Virtual Money plugins come with a settings page where you can manage the whole distribution.