Well I just created iPRO and I don't expect to have an overwhelming amount of members but we are going to need to advertise iPRO in order to get more members. Advertise it in your signature in other forums and give it some info about it to catch the interests of others. If you have any friends, ask them if they would like to join. Make some topics in other Forums and tell them were recruiting. Anything that can help will be appreciated.
Remember, the community is not going to grow by itself, it's the members of the community that make it grow.