That is cool... it's a positive wholesome thought to bring to mind when forking over our cash to Amazon etc. - a thought that is much preferable to, and more beneficial than an unwholesome "the Dhamma should be free" whinge.
"Do not force others, including children, by any means whatsoever, to adopt your views, whether by authority, threat, money, propaganda, or even education." - Ven. Thich Nhat Hanh
"Whether I were to preach in brief, Sāriputta, or whether I were to preach in detail, Sāriputta, or whether I were to preach both in brief or in detail, Sāriputta, rare are those who understand." (A I 333, Sāriputtasutta)