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Can you recover costs or raise revenue with PBwiki?

I am working in the voluntary sector investigating the use of PBwiki to develop a collaborative space for people to share journeys tips and take advantage of free concessionary travel

Due to the potentially large numbers of users there will be some cost to set this up.

I am wondering whether it is possible to offset these costs by earning revenue either through advertising or by charging sponsers to have a page of their own on the space.

Anyone done this before?

Any other thoughts or ideas welcome.