Even though you can be extremely profitable with a tiny list, growing your list should be a goal that you think about regularly. In fact, everything you do must work towards list building. This is all new to most of us, so it takes some time to get used to.
When I started out I did not fully understand this concept. I invited people to my teleseminars without asking them to opt in to my list, and gave out my affiliate links in the same way. Now I do not do this. I ask people to join my list, in return for a free report or audio recording, and then I invite them to my free teleseminars and bonus calls. This has helped me to build my list steadily for the past two years. You can do the exact same thing, but your list will grow much faster than mine because you will not make the same mistakes as I did.
Several of my students are growing their lists very rapidly by following my training. When people see the value in the information you are sharing with them, they will want to join your list.