Hmm, personally I really like garter snakes, hognose, and I've always wanted a pair of carpets, white lipped, or dumerils.
I think that huge snakes should be legal as pets. However, only people with tons of snake experience and knowledge, the ability to house them properly and care for them when that are big should get them. I do think that it is unethical for pet shops to be selling them, especially when they can charge the same amount of money for something like a ball python or a columbian red tail, and not have the issues that the big boids have. Same deal with venemous. I have friends who keep them, they know what they are doing (venom milkers, whoo!), most people should never even consider it.
*sigh* It would be cool if gaboon vipers and copperheads weren't poisonous.