Hey now,
I'm the guitar player mentioned in the first post on this thread. I'll tell y'all WHY I believe it NECESSARY for effects in the monitors....for ME.
First off - EXCELLENT POINT about not hearing your effects through your amp if you're a guitarist and only having them come out of the mains. That'd sure be stupid, wouldn't it?
If you USE, and I mean USE effects on your vocals, as a vocalist, then you MUST SURELY have effects in the monitors.
If you are content to sing and let the soundman worry about the effects, then SURELY you would probably want the monitors dry.
Neither way is right or wrong for everyone. MY argument is that I sing 99% of the songs, we share a mix, so get over it!!
If I'm singing, "Estimated Prophet," I want the delay to come through the monitors, so I can HAVE FUN WITH IT! Is it also fun if the soundman has HIS fun and I get surprised by that? Sure. But I'm having my most fun when I can control what's going on.
Reverb is the same way for me. If I'm singing, "Black Peter," for instance, I want that breath of reverb, nice & wet, on my vocals, so I can WORK the vocals. There's more to singing, IMO, than just singing the melody in my own voice. I work the reverb and it creates an ambience that you simply will not get from your average bar room.
If I'm singing Carnegie Hall, I'll let you know if I need electrically enhanced reverb on top of the room's natural reverb. I'll call you when I get there!!

www.theCAUSEjams.com
"Once in awhile, you can get shown the light in the strangest of places, if you look at it right." - R. Hunter
"If we had any nerve at all, if we had any real balls as a society, or whatever you need, whatever quality you need, real character, we would make an effort to really address the wrongs in this society, righteously." - Jerry Garcia