There are a couple of reasons I would use something like your service.
1. I want a cheaper alternative to something I really like. For example, I really enjoy Eagle Rare, but it would be nice to have something at a lower price point for making cocktails.
2. I want a more readily available alternative to something I really like. Going back to the Eagle Rare example, occasionally it is difficult to find. In this case, I would be willing to pay a little more to have something else that is similar.
This is exactly what I was thinking, I was trying to avoid suggestions that end up being a $10k bottle of whisky, I wanted them to be as similar as possible, without needing to ask the user too many questions.
Once I start getting into the big crowdsourced data sets is when this will get really interesting to see the connections between preferences.
Sounds like I need to try this Eagle Rare! I'm sure you've tried some of these already, but my personal recommendations are Lagavulin, Glengoyne and Edradour.
Simplicity will always be the main focus, I want to make this as easy as possible to not overwhelm users.
No hoops to jump through, just whisky!