I cant see any reason how that would make any kind of sense whatsoever, it wouldn't take a math major to figure that statement wouldn't hold water, you made the right purchase.
Good luck and if you have any more questions feel free to ask .........
Yeah, it doesn't make sense to me either. You can get good or bad flavor from a high or low concentration not knowing anything going in, but your final product is going to contain alot more of the low. It's the flavor that is the determining factor in my limited experience.
For the OP:
I bought everything from ecigexpress and in my limited experience, using the exact same 100mg nic and 50/50 base, it's all in the flavor. I have a mixed few I love, a few that aren't great, and one so far that I can't stand to use. Fortunately, the flavors are sold mostly in 10 ml bottles for just a couple of $, so if you buy one you don't like, it's not a big deal.
I grabbed some graduated 10 ml pipets from work, these are great for measuring the base, the flavors and nic are manageable driptip-wise or dropper-wise.
I use this simplified calculator:
eJuice Calculator 3.0 | EcigExpress Archive Cookbook
Good luck!