Hello!
Here are my comments:
SocialScapes/com - Not usual combination of words. I think it has some potential though. I would say high $xx to low $xxx.
PlatinumIngot/com - Might be a too narrow niche. I would say mid to high $xx.
360Pricing/com - I think it's too generic and the numbers hurt it. I would say low $xx.
All the best!