I'm giving up close to that as well. I wasn't going to do it initially (or I was going to go part-time), but I came to the realization that I don't enjoy what I'm doing and I don't want to continue doing it in the future. Due to loans, our lifestyle won't change a whole lot in law school, which was one of my worries. I'm able to take out loans that equal close to what I was taking home after taxes.
Do you enjoy what you are doing now? Would you be happy doing it for ten more years? Would you enjoy law more? You can't look at it 100% from a money standpoint, you need to consider quality of life and enjoyment as well.