earned a combined $127 million this year from ad revenue alone, on top of the list, daniel middleton, evan fong and dude perfect. and now some influencers are leveraging their fame in the real world branding their own merchandise to sell to millions of followers. >> the smartest influencers know that their fame has an expiration date and if they want to have a career out of this, they can't just be an influencer. they have to be bigger than that. they have to be a brand. >> homecoming makeup. >> reporter: between homecoming and gymnastics classes, brooke and bailey mcknight document their every move and song on the youtube channel. they are putting their own line of products branded with a double b in front of their 4 million subscribers. >> i would call it like an everyday line, like we've got t-shirts, wallets, pencils, notebooks. >> reporter: they recently launched their own mascara, too. was merchandise something that your followers were asking for? >> we're seeing any time we post a t.d. the girls want the outfit we're hearing. >> outfit of the day. >> otd ss. we decided to create somethin