Just an observation, but the first 4 posts in this topic were made back in early July of last year.(2012)
Although that doesn't matter much really... I just thought it was interesting that it came back to life after mac "bumped" it yesterday with his comment. I think that it is great!
In the interest of the topic though,
I still use decoy line for the same purpose as many use bank line. But I tend to use it in situations where I don't want to use paracord. I prefer paracord, particularly when it is cold out. Also to untie knots. But there are instances where the bank line can be better. Like using it for things that need a smaller diameter(thickness).Think primitive fishhook, or similar use. Or, for things you make to use that you wouldn't necessarily need to use other heavier duty cordage for, like a cooking tripod,or lashing poles together for a temporary shelter. I think it would not be a good thing to use as a ridgeline for a tarp, as I think the thinness of the bankline lends to the possibility of cutting into the tarp materials. But,I could be wrong... I just don't use it for things like that...To me, it is just "disposable" cordage. Also, I don't like to break down my paracord if I do not have to.
Some folks think it is the "cats meow" for most anything. Personally I think it is just another type of thin cordage. Just like Jute,Sisal,or even baling twine. Only bankline just has a tarred coating, where the others usually do not. Mason's line is also just as useful, as far as I am concerned. For the same kind of needs as the others. Cheap twine cordage...