Thats odd, at my local reptile shop, they had a pair of adult pines and a few babies. The babies were all a bit nippy, and struck at your finger, but the adults were calmer than any snake i had seen, they were about 7 foor, and just hang around your neck. They also loved to be stroked on the head, and would move their head on your finger if you stopped, if they were cats, i tink they would be purrrrrrrring lol.
If you manages to find a calm and docile pine snake, then i think that would be a great investment, but if there are only nippy ones, its up to you. Their bites are apparently pretty darn painful though
Good luck with whatever you decide to get!