I think it's important to exchange energy consciously and intentionally, and money is one powerful form of energy, it is currency after all. I always try my best to consider what my exchange is for anothers work. I don't download songs without paying for them, burn movies, download e-books, etc., unless they are offered by the author / producer or they are old enough to have enjoyed their fair share of payment for the work that has gone into them. I do borrow from the library, as part of a public service of education though, and when a book is useful, I often buy it as a form of repayment, but also, I often am late returning my books so give a fair bit of money to the library. I do consider it to be very important to give for what I receive.
In consideration of books or music for example, I consider the work others have done on a new book for readers to enjoy and gain benefit from. Although I could easily download a song online for free, I choose not to, but rather purchase the work. For a book it is much the same. I personally feel it is important to have a fair exchange of energy for the work an author has put into compiling, researching and writing the book along with all the other work that goes into creating a book, publishing it, etc., which assists and employs a fair number of people and effects many lives through families of those employed, etc.
I first came across the concept of money being considered in this fair and respectful manner when reading a book about druidry called "Walking the Mist" and it resonated as a great truth to me. Before this I still had firm beliefs in not stealing, etc., but hadn't considered so much my ability to affect the world through how I choose to direct my money.
Rather than buying from large chain stores that sell numerous products that are considered to be against my values, such as environmentally unfriendly chemical products, or child labour in third world countries, I choose to support smaller companies, and local companies that are more about providing specialized services and products that are guided by a passion for sharing what they have to offer rather than huge profit margins.
Money is energy, and through my choices, I, although in a small, yet impactful way, have the power to affect the lives of others and put my money towards things that I believe affect others in a positive way. Being guided by ideals of good ethics, and learning and making the best possible choice for the knowledge I have, gives me the opportunity to use this energy we call money to be a creative force for my own personal vision.
In terms of the law of attraction as well, I think it is always important to consider what giving does for the other, instead of always for the self and how it influences the results of others lives.