old timers do that because its best. So the question is, what makes best. Colubrid eggs are easy and simple to hatch. So what causes failure? With incubators, mechanical failure, its not just common, but guaranteed. Rooms, take a much longer time to change temps, so the eggs can adjust slowly. Incubators cause rapid change, that is deadly to eggs. Over the long period, rooms have less failure. Its as simple as, a tiny heater in a room cannot over heat. A small spike in outside temps, can cause small incubators to spike quickly.
Us real old timers also have an added education that is not taught now. In the old days, there were no incubators. So we hatched them on shelves in closets in our houses. We hatched them in real weird ways. And they were weird. Like in plastic fish bags closed tight with no ventilation. And that was the advanced method. It was mostly done in pickle jars made of glass, no plastic back then. With a piece of glass covering the top and vasoline applied on the rim. Again an advanced method. primitive methods were, in a jar and close the lid. Funny thing is, they all worked. Best wishes

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