I make some money from photography, but it is just the 'money on the side' and nowhere near a career. ; I've never considered insurance for my photography - I don't have a studio, don't display photos in a way that could injure someone or in a gallery or sales setting, etc. ; I don't sell photos with people in them or of private or copyrighted/trademarked things, to avoid any lawsuits of those types. ; And if I were to lose my camera quipment in a theft, fire, etc...it isn't that expensive to begin with, so for me it would be hard to justify insuring myself as a photographer or forming a company as the costs might outweigh what I earn from the photography! ; I would simply write it off as a darn-it moment, and that's that...and work on replacing the stuff.
I could see if you have a career from your photography, are making 5+ figures from it, or have invested in 5-figure equipment - then insurance would seem to be almost obvious. ; But for someone making a couple thou on the side in a good year, and less in an average year...it wouldn't seem worth it for me personally.
Basically, my photography income has bought my camera, lenses, and equipment...I don't really ask too much more of it - a hobby that pays for itself, and maybe some change on the side, sounds pretty ideal to me!