If you forced me to make a sweeping, blanket statement, I'd recommend you NEVER buy a one-time offer cross sell…. Especially if it's for an infoproduct (like a how-to guide).
This advice is sure to piss off a lot of marketers as there's a lot of profit in these additional buys. Markeing "gurus" like Dan Kennedy and Jay Abraham tout one-time offer upsells as the fast path to easy cash. And this is absolutely true. Some buyers are in "heat" and are going to gobble up anything you offer just after …

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There's no reason for you to struggle with list building. If you're ready to get fast tips to attract new buyers to your site, you might want to grab these list building tips, techniques and methods.

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There's no reason for you to struggle outbound telemarketing services. If you're ready to get more customers now, you might want to grab these telemarketing sales tips, techniques and methods.

Many people are afraid to call you. Some think they're going to get a high pressure telephone salesperson on the phone and will be coerced into buying products they don't need. Others feel they will be uncomfortable about asking questions. And some people just don't have much to say on the phone and are uncomfortable making calls to strangers. So offering a FREE booklet on your post card works quite well to eliminate these fears.