1. It would provide some insight, although not a lot, you can rate how good the team is from there.
2. Signature is by far the best strategy in my opinion.
3. Yes, newer members just say "woooow, Ripple $100 next year", while experienced members tell them that's not possible.
4. Discussions that include a small number of active and experienced users are the best ones.
5. Yes, there are discussions of pump groups, ICO's telling you to invest and they'll x3 your money...