When you asked "has anyone streamed to Facebook or YouTube", this sounds like you've never done it yourself. In that case, I think you're putting the cart before the horse, IMO. FIRST..... you need to become familiar with the process to live stream. Live stream in different areas a couple-dozen times so the process becomes second nature. You need to understand the limitations and the reasons some areas don't live stream as good as others. Get to know your smart device's ability to upload high data-rates to the nearest on-site cell tower, adequate to minimize glitches in your upload feed, from the field. Understand what the cell tower speed capability is, using an upload speed test at the target site at the planned flight location, at the same time and day, a week before the event. Learn the minimum upload speed required for glitch free streaming. Understand that YT works better than FB for streaming so you can set expectations of your client.
If you are going to charge money for something with your PART 107 certification (you do have one, right?), you need be an expert first, so you don't let your customer down from inexperience. After you learn the ins and outs of streaming, then you can figure out what you "NEED" to charge for the time you have LEARNED it takes to do it right, reliability. Like with most new businesses, you should start out by charging a price that's representative of YOUR experience, and build your clientele with quality work, using word of mouth, and your website, showing samples of your smooth cinematic work. In other words, don't expect to charge $3000/day because you heard another professional with years of experience has done so at an Apple corporate event. Novices should charge a much much lower price in line with their inexperience and quality of deliverable, and grow from there as the novice becomes an expert at live streaming. Novices should ethically target this kind of service with smaller events that aren't as important as a large corporate event, which naturally has an impact on price.