I work in the advertising industry but I don't own a small business. In general influencer marketing can be worth it depending on your goals and the type of audience you want to reach. The cost of using an influencer depends on their "influence" such as no. of followers, no. of likes, quality of content, and how active they are on Facebook, Instagram, YouTube, etc. You will need to research and vet influencers across different platforms to see if they match your company's brand, voice and style. Is this person someone who can speak to your brand? Keep in mind that an influencer is a representative of your brand, so a typical risk is that business owners use an influencer has no correlation with the business' product or service and therefore the audience is less likely to purchase from the brand.