Ask HN: What is a fair hourly rate split btw consultant and consulting company?

Hi Folks, Looking at a consulting gig and right now I am being presented with a 70/30 split. I've heard of much higher splits from others, but the consulting company is crying no mas. Am I getting a fair shake here? Its only my 2nd time consulting, and I definately got jobbed the last go-round. Was hoping people on here were in the know and could share what they believe constitutes an accurate and fair rate split.

Thx.