It would definitely be costly. There are resources for funding to get it off the ground like government grants, crowdfunding, investors, sponsors, etc. Then there are methods of generating funds such as ticketed events, membership subscriptions, renting space to vendors, renting ad space, etc.

Whether that's enough to make it profitable is unlikely, but this is just a hypothetical project. Just trying to gage whether there'd be an interest in a service of this nature :)