You've mentioned that disabling the add to cart and buy now buttons were as easy as commenting out the corresponding code. If that's true, that's awesome… and in one of the other responses, you mentioned being able to add my own HTML onto the single.php page.
Since I will be using this for an affiliate site, I'd like to make it easy for myself and setup a custom field with a custom buy now button attached to it, so all I do is enter the affiliate URL onto the Custom Field, and it will insert my custom buy now button linking to the URL i supply. I know how to do it, do you think that doing it would mess up any functionality of the script?
Also, if I buy the $55 version, and decide to upgrade to the devloper version later, can I just pay the difference?