Without a doubt, gold is worth the cost. If nothing else, having the free equipment evaluation loans are of great value. Being able to borrow an item at no cost (aside from return shipping) for two weeks so that you can test it before buying is extremely useful. Most rentals will run you almost $100 for two weeks. The clean and checks which usually cost around $50 (and you get two for gold) already pay for the membership. 24/7 phone support, event support, Live Learning discounts, repair discounts and expedited service...
Yea. It's worth it for any professional to get on board the CPS program.
As for the platinum level...personally I think it's only worth it if you tend to damage a lot of your euipment or very often. I've yet to really do any major damage so for now, I'll stay gold.