Here's some perspective,
The age of digital cameras changed the photography business considerably. For example, A single image that sell online with iStockphoto, now iStock by Getty Images has sold 150 copies and I have made $150 from it. The price of the image is $12 USD. I get $1 per picture or about 8% of the revenue. Service gathering groups like the drone groups listed above are virtually an identical business model used by Getty Images, iTunes, and any other content provider. They value their services at a premium while underbidding cheap pilot rates. They depend on quantity to become large enough to capture the market share and to be "The Place" for buyers to go for drone pilots and services. Value skewing is a common practice to creating a business model, value what you do as high and reduce the value of what you depend on, the bigger your business becomes, the more valuable your model becomes until it is the standard.
Stock Photo Example
Them = $1650, Their network
Me = $150, My camera, my image, my skills
Passed on the comments above I would avoid those groups altogether, or better accept jobs and then "No Show" to damage their credibility.
