IMO the 'sin bin' approach is best: 5-10mins off the field depending on the offence. It's not a major pain as a sanction but it's got to be annoying and embarrassing too I would expect. But because it isn't such a bad thing, marshals would feel more able to use it. If marshals have to choose between pulling a person from that game completely for a first sanction then another massively important consideration has to be considered - who is the person and how influential is s/he within what size group of friends and how often do they come to the site... ie can i justify possibly losing X amount of business for the owner over incident Y?
This may well be the mechanism that creates the infamous home team invulnerability... It's sad, and, as you say Black Death, I can't really get my head around it either (except where i have definitely shot someone and seen them flinch but they haven't taken it, then i have previously just refused to take hits from them, ignoring them entirely - but in hindsight this is not the way forward b/c it encourages others to refuse hits also), but get it or not, deliberate cheating goes on and maybe a sanction which marshals would feel able to hand out on no more evidence than a report and seeing what seemed like a transgression, but which the marshal was not right next to so they couldn't perhaps swear to what appeared to have gone on...
You get me, people? Things can change very quickly in the field and if all a marshal can do is boot somebody back to the safe zone and after that off the site, maybe they wouldn't unless they could absolutely 100% swear to a breach of rules that was actually dangerous, rather than just annoying. I have to say that I'd bloody dislike it if I was given a sin binning by mistake, but I could accept it, in the same way i accept 50/50's when I know for a fact I not only shot first but that if it had been a real bullet, my opponent would not have been able to aim and fire with his/her last breath (Body-T shot)*, or pyro kills when I got myself round a corner with milliseconds to spare: for the sake of the game mechanics - it would not work as a sport if every marshal decision was subject to a debate, so I may well chunner under my breath and/or express my indignation to a team mate, but knowing that such events are the price of the game running well makes it rankle a lot less. The same would be true of a dubious/erroneous sin binning I'm sure...
* This happens to me fairly often because, fat ill bastard though I may be, my reaction time is still very short, so when I've failed to evacuate a position to displace, in response to the opposition taking out my team mates close by or just overwhelming us with numbers and full-auto, because I couldn't be arsed, or was too fucked even if the spirit was willing, to move, I know my time is up - but I'm not going to just give up, I'm totally going to shoot it out with as many of 'em as I can before I get hit :lol: