I don't know if I can speak for snooker players in general, but since I play both snooker and pool, with more emphasis on snooker in the lastest years, I can give some input.
1. Snooker cues ARE low deflection, especially compared to traditional pool cues. The brass ferrule is very thin and since the tip is a small diameter for most cues, the deflection is allready fairly low. It's not a massive clump of brass on the end, but a very thin and short sleeve, with the tenon going all the way through. My snooker cue is actually on the high side of deflection, since it is 10mm (vs 9.5) with a very slightly longer ferrule, but it still isn't bad.
2. Snooker players like to stick to one cue, and generally dislike switching back and forth between cues. Once you've learned the deflection of the cue, it takes a long time to learn how a new cue plays.
3. Feel. Brass ferrule, ash/maple shafts give a fairly strong feedback. For a while I played with my Z shaft to see if it could be done. Yes it can, but the feel just isn't right. In snooker speed control is EXTREMELY important, since you're often playing the cueball out into open space and have to stop it on a dime. You just can't use the rails as easily as in pool.
4. Diminishing returns. This is rarely spoken about, but the law of diminshing returns is definitely a factor in cue sports. Most snooker players like to let their cues do the talking, and it's hard to really see a difference between "performance" cues, and regular ones. Can you screw back farther? Can you make more balls? I've seen a lot of guys switch to carbon and ld shafts, and frankly I've NEVER, not even once seen the player improve as a result. Not in any visible way, anyway.
5. Tradition. Especially in England, people enjoy tradition, and dislike gimmicks. I have a suspicion you'd get laughed at if you showed up with some hot pink carbon cue.