I think it depends on the amount of traffic you get. When you participate on forums, ask question and do hub hopping then your points will increase as people usually visits the profile and check your hub, maybe because of curiosity or whatever be the reason. Involving in such things brings you under spot light and hence more people visit your profile and read your hubs. For example, most probably I will visit your profile after writing this and check your hubs. So, I think it depends on how much traffic you get.