I've never used Reddit and I've read some about using it for promoting your items, but a lot of people have said people there hate when people promote their shop. How do you promote and do you get a lot of views/sales from Reddit?
Join a community. Like many social networks, no one likes when you just promote your stuff and don't contribute to the conversation. If you make freinds and become part of a sub, eventually people will ask you what you do and if they can see it.