In my experience being offered team lead with no increase in pay translated directly into additional exposure to blame when things went wrong with insufficient

In my experience being offered team lead with no increase in pay translated directly into additional exposure to blame when things went wrong with insufficient additional authority to change things to avert predictable problems. I personally wouldn't accept it (assuming no pay increase), with the full understanding upfront that such an offer probably wouldn't come again and if I wanted a better opportunity in the future I'd have to leave the company to find it.