I can't imagine that since SOMEONE has been in lline the whole time, that this violates their rules. MY interpretation of what you linked sounds like this:
You can't let ADDITIONAL people into line with you (each getting tickets) and if you leave for 'too long' you might not be allowed back in.
There is nothing about a switch out of people.
I agree with the other posters -- as long as you let the other people behind you (not just IMMEDIATELY behind you) I don't see the problem.
When my dd did sro for BOM, we swapped out several times. I even left for extended time -- but I made sure everyone one knew we were only looking for two tickets in total -- and one of us was always there.
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.