My use, do you mean do something with them? If that's the case, I use them all. However, some are just parked, a lot of PPC content sites up, and then the rest have full sites. I often park or put up a PPC content site while the domain is being developed. A few times the amount of money I was making from the domain alone more than I planned on making with the site. In that case, I stop the development of that domain and move on to the next. I might come back to it if the parking/PPC revenue dies down.
All my domains are for sale, too. I sell parked domains if they show potential, PPC content sites if they have anything of value (mainly visitors or PageRank), and I sell my developed sites. Developing and selling domains and websites is more of a business than a hobby right now.
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