da Silva.
Agree completely. You're not just paying for a bigger seat and nicer food - you're paying for peace and quiet.
It's something that I always carefully and politely controlled, except in cases of desperation (i.e those that physically cant wait for reasons beyond their actions/control - children, medical, elderly etc) - upon which they were discretely escorted to and from.
For the most part, I found it's usually a case of curiosity on the part of economy pax (how do the other half live?) - they usually do know better!
I was recently travelling on a near 7hour flight aboard a 737-800 - 2hrs prior to landing the senior/cm/cs cleaned and locked off the forward toilet. Despite a queue at top of descent, that reached the exit rows(!), which included premium pax and children (one of whom was crying!), her grumpy response was that 'i've already cleaned it, and i'm not doing it again before landing'.