is there a tool/program to see how much other sellers make?

this might seem like asking a bit too much, but i'll just ask it because i need this. any tools/programs/software that, when i type in an ebay id, it will tell me how much revenue they make per month? even better, breaking down their fees as well as exactly how many sales they make per each and every item?

I think goofbay dot com does something like this.