Coming back to your description, let's understand what was meant by Demi-Gods and following their rules for worship etc. > This verse was in reference to people who resort to some puja/ritual etc to please Gods who are not the "Supreme". Since there are some vedic references for people to pray to certain Gods for certain things, like a diseased person is recommended to worship Sun etc.. What Srhi Krshna meant was that there is no need to do such thing. Only those who are not driven by material desires and have intelligence to be free of materialistic goals and lusts will surrender to Supreme God Krshna. A pure devotee never goes to demi-Gods for material things, but depends upon Shri Krshna only. AND he is satisfied with what he is given.
The same message is also given by Shri Ram (not directly though). "One should live the way Ram keeps him."
I will get back to you with more on other Ved. But I am sure you are taking things out of context and using your own meanings.
