Did you just pull a random number off your hat? If you say 1 in 2 domainers has tm typos, then you must have some because I sure as hell don't have any.
50% is my own estimate based on what I've seen on the forums and countless other outlets.... You'd have to be either blind or illiterate not to see them, Many domainers have been quite bold in putting them out there, no shame at all in listing TM's or TM typos, or asking questions how to best monetize them, I've even seen some put them in their sig, everything from Youtube to Twitter to Facebook domains that infringe on someone else s hard work... A good example of that is Michael Mann, who was forced to transfer 21 domains that infringed on Facebook's mark, and this is a recognized veteran domainer who should know better, I know you and others look up to him
just because he's wealthy and successful, but look at the message he's sending to other domainers, he's basically saying that cybersquatting is OK.
I'm also reminded of the backlash I received when I posted here that "Cybersqatters are Scum", the negative response I got from that one post was a big wake up call of just many domainers peddle in TM's.