With everything you read, I think it pays to read widely. That includes, of course, when you read Robert Allen's stuff (along with everyone else's stuff as well). Let me explain.

For example, I have Robert Allen's book, "Creating Wealth". In that book, he covers a lot of different topics. I would tend to see this book as a possible "launching point" - it introduces you to a lot of ideas. It's valuable for introducing you to a lot of ideas which you might otherwise never even consider. However, for many of these ideas, you'll need to read more widely to be able to use these ideas with maximum profit and minimum risk.

My own studies haven't focused on Robert Allen though - I've tended to focus my activities mostly on mail order marketing / direct response marketing techniques on one hand, and stock market investment (Warren Buffett style) on the other hand.

Nevertheless, I think there are valuable ideas in his books - but of course, always read widely to get a more complete view of ANY topic.

And it goes without saying, don't do anything illegal (or which you feel is unethical). Books can't always cover this, because what is legal in one place, is illegal somewhere else - so you have to do this homework yourself.

- Dien Rice