It's all subjective! Worth going or not, and so on. Even on the savings, it depends on which visa you go on, where you want to go, and your lifestyle. You must decide why you want to shift to the US: opportunities, lifestyle, savings, etc.
I don't think there will be any issues for your parents to go to the US as long as you have the proper docs and show the funding properly. But this would be the regular B1/B2 visa route and stay for six months. Once you get citizenship, you can sponsor their green card, but that's a long, long time away.