Added expense. The price of steel has tripled if not more in the last 3-5 months. Tubing has gotten VERY expensive. Using good old DOM 2X.150" will save a bunch of money without sacrificing much weight (maybe 40lbs or so if that).
The other reason is some organizations that spec cage constructions do not differentiate between cro-mo and DOM so using cro-mo might not have any weight advantage (the reason for use of cro-mo is usually you can run smaller tubing with the same protection for weight savings).
I have a friend who installed a very nice cage, passed tech at almost every sanctioning event EXCEPT the one he drove 800 miles to enter. They turned him around for floor plate size. I always recommend overbuilding the hell out of everything for that exact reason.
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Dennis
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