No company is worth 70% commissions, sorry. Personally, I think you should join a 100% commission office and never look back. This is the new (now older) business model, it works and it's successful beyond belief. If you're a self starter, then go for it. Here's a blog I wrote here a while ago about full commission brokerages. Some of the numbers have changed, our office now has over 700 agents.
GOOD LUCK. Scott Miller Realty Associates Boca Raton, FL