Hi Duck! Nice to see you here as well as your great graphics!
I can understand why you may be kinda between the proverbial rock and a hard place in that you have more than on professional business along with the various associations accompanying each of them. If you opt to take on the JOB of official photographer, I am sure the folks on the piercing side of your endeavors will appreciate that you have a professional photography business to consider as well and you need to do work and create profits for your photography enterprise. As a strictly business consideration, if you are paid a fee to somewhat compensate for your time and efforts and perhaps yield a modest to better profit- it may be to your advantage to accept the gig as documentarian. If you don’t receive some money and have not made editorial contacts before the shoot, you are working strictly on speculation which can be somewhat disappointing, especially if a lot of time and hard work is involved in the shoot. It’s hard to determine a random fee schedule for this kind of work if I am not aware of your overheads, business expenses and your required profit margins- that’s how I determine my own. Perhaps you can base them on your time charges for your commercial photography business or even your tattoo business- your professional and fine workmanship have to be considered in you fees. By the way- I have no policies or objections against working on speculation but I try to gage the potential from past experiences, the scope of the job that needs to be invested in time or out-of-pocket expenses. I do like to stack the odds in my favor, business wise, by checking out some avenues of sales in advance.
If you shoot the job, even at a nominal rate, you may have an opportunity to make many new contacts for your photography business and meet others in the tattoo or piercing industry who may wish to avail themselves of your photographic services. After all- you know the ins and outs of their profession and you can better serve them as a photographer than someone else who is not as familiar with the aesthetics of their crafts.
Appearing on a panel at one of theses events may have some prestige or business advantages as well but I can’t advise your there because I don’t know how networking goes on in that industry.
I have only one business and it’s all photography but I am still a “hired gun” for most of my clients- I work at their pleasure and provide them with their requirements- hopefully and thankfully, I get to inject my own creative input in many cases.
I hope this helps! I am looking forward to more collaboration with you, on this new forum, in the months ahead!