I'm going to put a donation system into my web-app because I need to raise about $6.2k for a school-organised trip to Borneo.
Inside the app, I think that I will tell everyone, on the donations page, what their donation will be used for; which opportunities this trip will create for me, and how I will be helping to build public facilities such as schools and toilets for the locals, who barely have access to clean drinking water.
What I want to know is, should I show a progress bar alongside the donations page?
I thought this might be quite a cool feature, my only qualm being that their (the user's) $5 or $10 donation will be measly in comparison to the total amount of money which needs to be raised, so the progress bar will barely move, if at all. It will probably only progress in the sub-pixel area.
So, what should I do here? Not show a progress bar? Just thank them after they donate, saying "Thank you! I am now $-- closer to blah blah!"