Paid Reviews are one of the main sources of income for many many bloggers, including my self. It’s easy, somewhat fast and a noob can start making money with little effort.
The process of receiving money to review a site or a product can lift some impartiality issues. We can think that if someone was paid to write about something will tend to do it in a positive tone, even if they don’t know squat about it. It is really easy to write a 50 or 100 hundred word review after looking at the site for a couple of minutes. But those kind of reviews only request some buzz and some links. And the advertiser does not care if the writer spent a lot of time researching.
But this brings another negative aspect. Google does not like paid reviews that pass some link juice to the reviewed site. And what does it do when it detects this? Google slaps your blog and you can say bye bye to organic visitors!
For that reason, more and more bloggers don’t disclose that it is a paid review, and use a sitewide disclosure page. Individual or sitewide, it is important that we disclose it was a paid review. The reader deserves this information and decide if it will continue to read or not.
For these reasons and more, many bloggers don’t do, or limit the number of paid reviews. But after this long introduction (yes it was an introduction lol), i will give:
5 reasons why you should do paid reviews on your blog:
1- You make easy money (dahh!): It is easy. You just need to signup for any paid to review site and get 
an opportunity. depending on the offer and your writing skills you can write a decent review in 10 minutes, and there are some offers that pay $10 or more for a 50 word review!
2- New advertisers may appear: If you got a paid advertising from private ad sales it is a complete different case from point 1. I recommend that you write the review slowly after a careful study of the site and be impartial. Ask for information, see what the advertiser pretends, and If you do a review that the buyer liked then he may ask another one later or even recommend your blog to a friend. Word of mouth is the best advertising you can get.
3- Bring more visitors from search engines: Ok, some say that if you write a review you should try to fit it to your blog subject. That is comprehensible. But you won’t loose nothing if you write a review that is not related to the niche of your blog. On the contrary. There is the possibility that your paid review attracts visitors from google searchs. They visit your site, may get interested on your blog subject and you earn a new reader. Also, visits from search engines are known to click more on adsense ads or affiliate links than your regular visitors. It is a double win: You get paid to review, you earn from visitors that come to that review.
4- Paid reviews may spark your comments on your blog: this may not result for everyone and depends on several factors, like what type of comment plugins you use or the skill you have to adapt the text to your blog subject or to your own experiences. 
I did several paid reviews that caught the readers attention and made them comment, and sometimes creating a little discussion around the subject. And we, the bloggers, love to see some activity in the posts we create. If you see the review is not of the interest of your readers than if possible you should associate an experience you had, like a problem you had with hosting and what have you learned from that, or even about a loan you took a few years ago. This may encourage readers to share their thoughts and experiences with you.
Again you win. You win money and see your blog active.
5- Find something useful: I could mention another advantage such as you can increase your writing skills, but that you accomplish every post you write, and so, as a 5th reason i choose the possibility that paid reviews offers you the chance of finding something useful to you and your readers. I have found offers that were useful to me, by browsing the advertisers list of by reading other reviews made by fellow bloggers.
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