After 9 years of full time content creation, I've lived the good and the bad of what separates a creator who just gets sent free product from one who actually gets paid. Most of the time, it comes down to how you negotiate, how you close the deal, and how you foster the relationship. That's hard to do on your own, so I built the thing I always wished I had. Lamb Chop prices and negotiates your brand deals for you better than any agent I had has done, so you keep your full rate and stay in control of your own career.
Note that the pricing system I have is the most effective to get not only what you deserve, but also what the brand expects so that your creator to brand partnerships have the most success.