When I alpha/beta read a story I give my everything. I try and do my best to make that story the best it can be. I love giving feedback to the author, help them in the parts they are having difficulty, give suggestions, even if those only serve for the author to realise they want to do something else, polish any little typo or mistake that went past the author, flail and get silly and excited in the parts I loved the most.
Beta reading takes time and effort, but in my experience 100% of the time the author is absolutely thrilled and thankful you're dedicating your time to work with them and help them.
Beta reading is a bit like being the magic behind the magic. And the end of the day, there are few things better than knowing you were there for someone when they needed, that you helped an author to work on something they can be proud and happy with, and often times it's the beginning a beautiful friendship.
hd_erised is asking for Beta Readers volunteers for the fest. If you have a moment, please consider signing up as a Beta. I know authors and artists alike will be very grateful if you can help them. :)