You would need a lot of money to compete against existing models that are already advertising on TV etc.
I don't want to rain on your party but even if you find something that others aren't doing, they'd simply copy it.
I do hope you find your eureka moment, however I'm afraid this is a market that has been explored.

Regards,

Dave

Review site software, as a type, already exists. I think even Wordpress has a plugin for that. So you don't need to develop from scratch.

You just need to find a lucrative niche.
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I agree with Dave, the competition is big in this market, however, if you could find a unique "hook" to your idea, it could actually work. Best of luck.

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