why do some roulette wheels seem to favor certain sections
What matters more than the air is whether anybody's actually checking the wheel. If a place lets the same ball stay in too long, or the frets get nicked up, you'll get a section showing up more than it should and people call it luck because that's easier. On our floor years back they pulled a roulette wheel after 3 numbers out of one 9-pocket arc landed 17 times in 212 spins, not magic, the bowl was slightly off level. Humidity maybe a LITTLE, sure, but maintenance is the boring answer and usually the right one. American roulette hides a lot of junk too just from extra house edge, people don't track enough to see it