The post print doesn't look as good as the published version

Highlight and sell benefits of open access – with research more accessible.

Create a coversheet system for full text items in your repository that tells the user what version (i.e. preprint, postprint etc.) they are looking at. This helps sell the idea to the researcher, especially if you also include info on how to cite the published version in the coversheet as well. Open the PDF at http://oro.open.ac.uk/19033/ for an example.