You're talking poop, dear sir. Show me a dell machine and then the equivalent parts bought separately, then factor in the bundled software (probably just windows), the costs of you putting it together and the costs involved in the warranty, then get back to me and tell me it's a good earner. It's like opening up a fruit and veg store and going into direct competition with Tescos or something: it's just not going to happen.
I did have the same sort of business a few years ago, but only when I was at university as I didn't want to be tied down to working shifts or anything. It earned a few quid, and I had to work far less hours then other students working at, say a shop or loacl bar, so it was good for that. I was a student at the time though, so I was living on practially nothing.
Yes, you can make some from small businesses, but you're not going to be retiring at 30 with a few million in the bank, for sure.
