There are 1000s of reviews out there by many other people. Some of them do reviews professionally, some do it for other business reasons, some just do it to complain, and some do it for vanity. There are many other motivations and many different types of reviews.
So why do I do reviews? There is one selfish reason I do reviews. If you you’re your going experience something that you later know you will have to write or explain you tend to pay more attention. You notice more, the subtle details and nuances. This makes my experience richer and more enjoyable.