The published materials category is broken down into two sub-categories:

1) The Wetdryvac.net Free Library, a concept the Vac is particularly fond of, inspired by Baen's Free Library.
2) Published materials with a cost.

Wetdryvac.net typically publishes two variants of materials in the catalog – free eBooks, which are made available to the public, and print books, calendars, and similar items which can be stored on your library shelf at home or given as gifts. The Vac holds that digital copyright and intellectual property is important, but also suggests that profits go up with digital sharing, and has had excellent profit from people sharing the digital versions of the work.

Bottom line: If you like the work enough to buy the print version? Do so. Recommend things to your friends if you wish – but don’t feel obligated to. Decide for yourself, and the Vac will be pleased that you made up your own mind with neither guilt nor threat.