no, you always switch
because then there is a 2/3 chance that you will get the money
to illostrate it, here are the examples
1
you choose the first box with nothing inside, host takes away the other box with nothing, switch and you get the money
2
you choose the second box with nothing inside, host takes away the other box with nothing inside, switch and you get the money
3
you choose the third box with money inside, host takes away an empty box, you switch you get nothing
so if you switch you get a 2/3 chance of winning