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Depends... if it takes 20% of your time to make your site work for 1% of your potential users who have a feature disabled, I say forget it.

The caveat to this rule is, of course, if you have a site that is very heavily trafficked.

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That's an arbitrary and useless guideline, using made up numbers. If losing 1% of your potential users costs $100k in lost sales a year, and 20% of my time costs $20k, then spending that 20% time seems like a pretty good idea.

See listed caveat. If 1% of your users are netting you 100k, your site is likely heavily trafficked.

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