I started publishing sponsored videos this year. I produced a media kit to send to potential sponsors and a fixed price per video. Big mistake. The fixed price was far too ambitious and although everybody seemed to like the idea, they were put off by the price.
So...I massively reduced my fees and immediately started to get orders. Since then I have slowly increased the fees and have now found a level that both I and the sponsors seem to be happy with.
My point is, that it may be better to start low - even if you feel that the first few videos you produce are not worth the time and effort. You can then slowly increase your price until you find the right level. The more videos you produce, the more your channel will be noticed by other companies who want to have their product reviewed. At that point, you can say with confidence "this is how much I get paid by everybody else". Most companies will feel more comfortable spending the money if they know that their competitors are doing the same.
This is exactly what I have been doing. First I did a bunch of product reviews of outdoor sports and tech equipment products I bought for myself. When I did this, my intention was not to get in the sponsored product business, it was to just to build my channel and draw in a different demographic. Then I started getting a rare and occasional offer to receive a free product in exchange for a review. I was fine with that as it gave me more content. But now the flood gates have opened and I am getting 20 emails a week about different products. Since I don't do simple "Unboxing" videos where a take a new product out and say "Look how shinny it is!", but I do real life testing and comparison videos that may take 20 to 30 hours of work to complete, this is becoming a full time job.
On one hand, I like doing this. It is fun to test out new products. On the other hand I have a very high level of dedication to honestly and practicality. When I do a review video, it never say "This is a good product" or "This is a bad product." I let the test I perform reveal to the viewer whether the product is good or bad. I make product reviews the way I would want to see a product review. I don't give a rats behind about "Technical Specs", I want to see how things work in a real life practical situation. That is what I would want to see in a review video, so that is how I make them.
Take the product review I am currently working on. It is a Chinese 4K action camera. I have done multiple side by side comparisons with it along side other 4K action cameras I have. The footage from these will be put up for the viewers to see how it did. But there is a problem. The 4K files from the camera have proven to be uneditable. I have tried multiple top video editors and that files cannot be edited and cause the programs to freeze or crash. There is also something screwy with the audio sample settings which shows to be at, 15kbps at 8.000 kHz. So, I have emailed the seller and presented this problem to them and ask them whether they think the camera is defective, or if a should continue the review and report these findings.
Now the waiting game begins. If they are a seller that is dedicated to their product, them may try to provide a solution or a different camera. If they don't care about their product and just wanted me to produce a product review for them and say good things because the gave it to me; well they have a wake up call coming. Because all of this, even their reaction to this problem, will be included in the review, because product support is a big part of what makes a good tech product. Even top of the line tech products can have have technical issue, just ask the people that bought the explosive Samsung Galaxy S8. It is how the company supports consumers when the things happens that makes the difference.
My point here is, I would like to earn money at this becasue I put of work into my product reviews, but I am not willing to sell my soul for a free product or money. My hope is that one day I will graduate up from these budget oriented products and get to work with respectable name brand companies that care about their products and customers. I guess it is kind of like trying to work you way up the chain from a toilet scrubber to upper management. I may be a low level toilet scrubber right now, but because of who I am, I will take pride in my work, even if it is scrubbing toilets. You got to start somewhere, right?