Pretty straightforward, I watched a video online about mixing your own liquids, and I understand how, but I was confused on one thing. On ecigexpress.com you can buy a 60mg 30ml bottle of unflavored nicotine base for like $9. When you choose it, it asks you if you wan pg, vg, or a 50/50 mix. My question with that is, if the unflavored nicotine base is meant to be diluted with pg or vg, why is it already mixed with pg/vg? Wouldn't that be like diluting it twice?