So 150,000 times .07 equals 10,500 thousand dollars in interest alone per year. You are paying $10,500 a year alone in the first year(the next year will not be much less), but to actually put a dent in your loan you will have to double or triple the interest, so we will say about 25,000 a year to be safe! You will be paying 25,000 in net liquid cash to the banks who loaned you the money and are most likely laughing at your foolish decision!
Your numbers are not accurate. Also you are not taking in to account many law graduates will be in relationships or marriage by the time they graduate. Like most couples today both people work. So the numbers you portray are not accurate because lots of times you have two people working off one debt.
At the t14, a lot of students are delusional about what it's like to work at a big firm. Many have a hotshot attitude and think they'll make partner and will take on a lot of responsibility for big cases or deals very early on.