1) My primary reason for buying BSOs is the education they can provide. And since I love learning about new topics/techniques/etc., I will frequently buy BSOs with no real expectation of implementing them, at least immediately.
2) I find the sales letters for successul BSO sales to be useful to see how they are written, and then compare the description to the actual BSO.
3) We all have different ways of learning, and sometimes the way one BSO presents the information clicks with my brain in ways that others don't.
4) And lastly what I consider to be unethical, I get sucked in by the sales letters written as though this will work for everyone. In fact, a whole set of other (unmentioned) criteria need to be in place before it stands a chance of working.
One example of this might be "How to Make $4,526.24 Tonight, After Dinner, and Before Bedtime." No problem if 1) you already have a product that provides value YOUR list wants, 2) you have a great relationship with your warm to hot responsive list, 3) you have a distribution system already in place, 4) and a few more etceteras.
So I'm curious what are the major reasons others here buy BSOs?