It's not uncommon if you reside on other forums, especially ones where "heated debate" takes place. It's more an insult than necessarily being meant to seriously imply that guy is actually being paid.
Proper shills are far more likely to be found on community review sites like Trip Advisor or even Amazon than a discussion forum. That one five star review when all the rest are rubbish or non existent? That's likely a shill posting, although its not entirely impossible that someone did just genuinely enjoy it that much.
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