1. Yes, of course. In 99% of all modern research groups you need to do regular presentations of your work within the group. I would say every Prof. has learned that letting the people just do the asters and looking after 2 years what comes out is not the right way, so they insist on regular presentations.
2. No, not in Masters, I even know people finishing the PhD without it. For me it was always the best...I am going to at least 2-3 conferences each year since ~10 years. I already attended 3 conferences this year, until June it will be 5. I can only recommend it.
3. No, not in Masters, only in payed PhD. But you can earn money with teaching and you learn a lot.
4. Well...you need to work. Bachelor is just not being stupid, the further you go the more work comes into play.
5. Depends. But I think Masters is more mandatory than PhD. I am from the old people who think Bachelor is no degree, but a step to a degree, so I think I have issues with hiring a Bachelor. He needs a good story why no Masters...or gets a job which is not worth a Masters.