Should friends initiate contact with each other roughly equally?

Some of my friends never initiate contact with me. They are friendly, loyal, and otherwise great friends. But for any interaction or get-togethers, I must initiate conversation, suggest activities, and so on. Sometimes, I feel as if I value the friendship much, much more than the other person does. Is that an accurate assessment or is something else going on? Should I just seek other friends? Should I talk to these friends about this issue? (If so, what should I say?) In the future, should I seek out different kinds of friends?