I agree with Tankist that just because you are forcing people to register, doesn't mean they will stay, or even contribute. The great thing about this forum and reason that I signed up was the core posters on here give very helpful replies to any questions that may be had. The quality was the sole reason. I haven't made it to my reading limit yet on my phone, but will be a little annoyed when I have to sign in, which can be a pain, when I am on the road (not literally on the road, that would be bad if I was reading this while driving around).