I think this is the way to go. Offer folks one or two shorter examples of your work for free, and they will be more comfortable with purchasing your longer works.
If the free examples are solid, then they will be linked to and shared. This will help establish your name and expertise in the subject matter, and will bring many more eyeballs to your site, which will hopefully convert into sales.
If the free examples are solid, then they will be linked to and shared. This will help establish your name and expertise in the subject matter, and will bring many more eyeballs to your site, which will hopefully convert into sales.