I guess you could even build some kind of PHP/MySQL thing whereby all the domains redirect traffic to a script that:-
A) Reads the domain being visited
B) Looks up the "niche" in the database
C) Shows the appropriate page(s), exit consoles, blurs etc.
The only other work apart from the script itself would be to code domain names by niche and also to code advertising material by niche.
The development cost would very quickly pay for itself on a high-traffic site, I would imagine. Plus with an automated system, the maintenance time to swap sponsors in and out would be measured in minutes!
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