You can come up with obscure reasoning for almost anything.
Duplicate content sites are a waste of time.
Built and optimize your site for the traffic that you want to attract and then market it to your target demographic. Period.
Building multiple sites across multiple domains was never a good idea, even 10 years ago when everyone was doing it.
You don't see any successful marketers doing that, so why do people still think it's a good idea?
Who, what or how you get traffic is going to depend on how you market and advertise, not how many duplicate sites you have.
The only way this MAY make any sense would be if the sites were translated into different languages for different markets.
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