You could, but it's not a straightforward transaction like on Squidoo. There are plenty of people here who buy copy from ghostwriters, so that type of transfer is possible. You also could sell the contents of an entire account, and once the new owner had access, they would need to change all the affiliate codes to their own. They'd also have to meet all the conditions stipulated in the TOS regarding ownership and identity, etc. or they could find the new account banned.
HubPages doesn't encourage this type of behavior and the website construction impedes it somewhat, but it could be done. This question most often comes up when someone dies (which has happened once to my knowledge) or someone asks if they could pass on their Hubs to their heirs.