Well,for starters,they aren't quite as common as they are in Australia,so I can understand the "Why?" statement
I'll break it down for you:
4- Everytime folks would pass me on the highway,it was inevitable that the passenger in the car would give themselves whiplash staring at it.
3- It would snag low-hanging tree branches sometimes
2- My co-workers nick-named my XJ "Snuffelupticus",whatever that means,but I was certain it had something to do with the snorkel
1 - The absurdly ridiculous questions that I'd get asked relating to it,such as:
"Is that a camera?"
"Is that a radar gun?"
"Is that the exhaust?"-this one's especially funny,as the engine could be running,and they'd put their hands on it and *STILL* have to ask,anyway! I'd just reply "Yep! Space age PLASTIC exhaust!! You saw it here first"