Is it a good idea to develop a .net domain and just leave the .com of the same name parked? lol. I've thought about doing this, but I'm not sure.
I don't know if that would be a good idea or not. If you are going to develop the site it would eventually get more traffic than the other. It would be best to put your main revenue sources on the developed .com and have a parked .net for extra income.