You have a common law copyright and trademark on your logo, even if it is not registered. Thus, they do need written consent to use your logo in those countries. All you need to "rent" or the legal term is "license" your logo is a written contract with the terms under which you are giving them permission to use your logo on their sites. Most sites will not pay to use a logo if they are using it for advertising and they will just tell you that it is advertising your site and as such that is the consideration
for you granting them permission to use your logo, so the value of your consent is not going to be that much money. Furthermore, by law, even if you deny them the right to use your actual logo, they can just use the name of your website and your web address on their site without your permission. Generally though, in this type of situation, these companies would not be willing to pay more than $100 for the license at the most, since they can simply use you name without any permission and not be in violation of any copyright or trademark laws, especially if they are just saying their company was reviewed on your site, as that is considered "nominal use." An additional consideration is that if you start actually charging companies for use of your logo and your site is reviewing those companies, the allegation can arise that you are seeking to charge them for favorable reviews, which diminishes the credibility of your site.
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