Until now, I believed if the humidity wasn't exactly 70, then your cigars would be ruined.
But now, from hearing you guys and a few cigar storage pages on the 'Net, and from having 25 Indian Tabac Limited Reserve set out of a humi and not one turning bad (and our RH is usually between 60 and 75 here in Indiana), I realize its BS.
Cigars are more resiliant than some would make you think. Though it's better to have a lower humidity (like 60 to 70) than anything over 80, because overly moist cigars get moldy quick and are hard to smoke.