I have many people requesting images from me. The best solution was to add package deals. You choose the package you want and simply fill it up with any images you want, pay and download. You can choose packs of various sizes - 10, 20, 40 and 60.
You are reminded that these are for personal use only.
Regarding student events, I wish I could offer images for free but unfortunately I have costs and overheads to cover. If you take into account the travel, shooting, editing, equipment wear and tear etc, I hope you find the low cost of the images value for money. The government are constantly cutting funding and I have to try to finance my own studies.