I'm not speaking from personal experience - so take some salt - but from talking with friends [who do tech support consulting] your best bet is to target small to medium business', rather than consumers. That's if you're going primarily for money - it may be more personally rewarding to work with consumers (especially if you believe some of the posts here, although no one I've talked to has had the opportunity to mix business and pleasure to that extent).
With business', you can build up a really good regular customer base by demonstrating that you trust and care for them. Carry a set of spare components (hard disks, ram, maybe an optical drive or two, etc) with you all the time. If some hardware is acting flaky - and you can't fix it immediately - lend them a replacement and/or substitute. Most business' will be used to lazy, pushy & expensive IT guys, and the mere act of lending them a replacement stick of ram for a week or two will boggle their brains.
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With business', you can build up a really good regular customer base by demonstrating that you trust and care for them. Carry a set of spare components (hard disks, ram, maybe an optical drive or two, etc) with you all the time. If some hardware is acting flaky - and you can't fix it immediately - lend them a replacement and/or substitute. Most business' will be used to lazy, pushy & expensive IT guys, and the mere act of lending them a replacement stick of ram for a week or two will boggle their brains.