There is absolutely no reason that you should pay for using the forums, you're not being forced to do so in any way, no one has pressured you to do so. We have many members here that don't subscribe and enjoy their time here.
It's interesting though that you want something for nothing and that because you're a minimalist bushcrafter you should be accommodated by others paying for your wants (in this case to post pictures) who do you think pays for the servers, software, maintenance, time etc etc that keeps a forum running?
We don't sell your info, we don't manipulate your experience and monetise you, we hardly advertise anything, we don't push membership etc. All so that people have a Bushcraft orientated forum to call home no matter what their financial situation.
Those that do help support the forums are appreciated and they generally do so because they value them.
If you're proud of using the bare minimum why are you upset at not being able to post images?