Nice work ! You'll find that about 75% of people who add you to their watch list are people thinking about selling something similar just doing a bit of market research.
But a good technique is that you can send personalised time-limited offers to people with a small discount which can help tip undecided buyers over the line into actually hitting the button. I have a feeling it's something you can automate , as well, although I've never done it so I have no idea how it's done !