Re: Registering to buy something - Why?
Having said that, discount codes can be set with a limit for the amount of times they can be used, plus blocks on multiple use by the same IP (probably even better than email), all without the need to register.
There are merits in both ways though, just depends what you want out of reporting etc, and how much repeat business you get. For me, allowing 'guest' checkout with the option of 'member' checkout is the best way of ensuring customers complete their purchase.
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Ian D.
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