I think it all depends on the industry and market you operate in; and also what your customers would consider interesting and relevant. An email should be considered a trade, their time for your content. Would you want to read multiple emails a day with your content? Take the Financial Industry for example, many people want to be kept up-to-date on news and market changes or products that can help them trade better. A sub center for many financial websites could have dozens of choices (Gold, Silver, Oil, Corn, company stocks etc..). These areas could all have things happening at the same time and therefore require multiple emails in a day. Having a communication limit would mean starving that customer of information he/she wants. Again I think it all boils down to content and what you are offering your customer. Up your limit and see if it affects your level of unsubscribes, if it does then think about bringing it down again.
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