This very post is predicated on the notion that folks will blind purchase tobaccos they haven't tried. Some do, some don't. Then those who do usually try tobaccos they get, while some may experience circumstances where those tins hit the cellar and events conspire to prevent sampling... I am in this category.
When I first dove in, I found I liked nearly every blend I tried. I read up on reviews at tobaccoreviews and followed Jim's reviews on here. I bought tobaccos that followed my taste profile. I made many orders in this time. Many of my orders included 1-2 oz samples of blends that sounded fun while others gave free sample. The tins I did open went into the tiny jam jars so they didn't dry out. Over the course of about 3 years I ended up with about 60 jam jars full of opened tins/samples of tobacco.
I have never been a prolific smoker. I had a young kid at home, my new wife is awesome but doesn't love any tobacco smell that isn't a deep aro, and I just often had things going on that didn't enable a ton of smoking. In this system, I felt it kind of silly to keep opening new tins until I had finished at least some of the little jam jars.
This did not stop my buying, however. There were $5 tin sales on some pretty amazing blends and I would go, why not? Did I try all of them? No. I was buying at a good time when many people were saying the end of tobacco as we know it was nigh. As a result, I am sitting on more than 300 lb of tobacco and I have not tried quite a few of these blends. When I do, if I don't like them, they will be liked by someone and well aged. I figure they can trade out for stuff I do like at a pretty favorable rate.