Nope! I tend to do my best to ensure that my bikes are completely sound, road worthy and safe to ride. Even if it is safe to ride with four bolts, the worry about potential failure would always plague me, thus interfering with my ability to enjoy the ride. So...
Cranks are not all that expensive. Though, like everyone else, I hate parting with my money, twenty or thirty dollars is not all that much to pay for peach of mind and enhanced safety. That said, I did spend the last few weeks in Jamaica, last winter, riding my old Bianchi with one missing rear spoke. That said, a wheel going out of true is not as prone to dumping me on the ground, something that a snapped off chain ring just might do.
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"98% of the bikes I buy are projects".