Aerating/Seeding Lawnmower

While mowing the lawn today/night (BTW, you know you're a red-neck if you have lights on your lawnmower and ever had to use them) I couldn't help but worry over the bald spots in my lawn. I figured that if I aerate my lawn and then seeded it, I might get a few results, but who has time to aerate, seed, then throw some mulch out so the seeds don't all run away when next it rains? Not only that, but have you seen the price of seeds lately? I'm not too poor, but I don't really have that much money to go spending it on seeds every other week just to watch everything down hill getting greener and my yard look like a bruised apple starting to turn bad. What I propose is to have a mower accessory that attaches to the bag (or where the bag attaches to the mower) that would cull out the seeds in the grass. Once the seeds were seperated everything else would get sent to the mulcher. While everything is getting chopped up into little fertile bits the seeds would go into a heavy, hollow drum with spikes coming off it and small holes in between the spikes. The spikes would aerate the ground and seeds would fall out of the holes. Then, after all this work, the mulcher would dump it's load ever so slowly over the area that was just cut, aerated, and seeded so that the seeds wouldn't get washed away in the next watering.