Thanks for taking the time to anwser Phoenix, even if I don't necesseraly agree with everything I've to admit the approach is more than reasonable. I reckon if I was hosting it myself I would probably come to change a few things however it is your tournament, you've proven to make it successful countless times in the past and I've no doubt it will be the case once again. As you said it yourself, it can always happens to change if you think one way or another would be better.
Also really like Salakien's idea about the playoffs phase for the one argument he pointed out which would be to have roster closed (or something along that line) once the playoffs start so it prevents the issue I've highlighted and it still keep the tournament competitive.