^^
Unfortunately, you are right! Many big companies do it too and it will certainly bring you more customers/money. But don't you think this practice is unethical and a bit deceiving, even if you run a legit and good service?
If your services are good enough then you don't need to buy reviews, just give it some time and your satisfied customers will leave positive feedbacks for free.
Buying reviews is one of the reasons why people do not trust those review websites such as trustpilot..