I won't say *always* check TO, but yeah, before doing a batch with a new requester you should. The Public Group sucks, by the way, just terrible, awful pay, incorrect rejections galore, whatever their TO is it's too high.
Iffy due to one person getting upset for the time/compensation ratio. I would read the reviews instead of just going off of the bars.
No offense, but just 'cause you get rejected doesn't mean you should rip someone up on TO. I have 46 rejections on a bit over 6200 HITs and there's only 5-10 I probably didn't deserve, I've had a lot of luck getting unfair rejections reversed but I also make mistakes and take risks... just because you get rejected doesn't mean it's the requester's fault. Don't worry about it, just pay attention, read instructions, and do your best. I doubt rejections are the main thing they look at for masters, but that's just my hunch.
I did read them. The one person got rejected wrongly and took forever to get it overturned. I wouldn't risk it, but that's just me.