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An increase in sales from $400 to $900 a month is compelling evidence that these annoying tactics produce good results? Color me unconvinced.

Requesting a price quote is a deal-breaker for me. And if I got that email, I would just assume that he couldn't take the time to spell things correctly in whatever he used to generate the mass emailed "reply" - not that he typed it by hand himself. Why would that make more people want to buy software he had developed?

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More than 100% increase in sales and you're unconvinced? What kind of numbers would convince you?

The percentage increase is only part of the data. If his sales went from $10K to $20K per month for 4+ months on a $300 product, that would be a lot more compelling.

A sample size of more than a handful of sales per month (since the software cost "between $200 and $500") would make it more convincing. A randomized experiment would also be more convincing, and not hard to do.

Not very convinced either. Could be a 1000 other reasons why sales increased.

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