Have there been any studies on the effects of being able to see the effects of your donation to an EA cause first-hand?
Cause I'm guessing that from a psychological perspective, it could matter. Also if it's not just first-hand but personalised and non-fungible. Like "this specific child or alcoholic is being sponsored by you" rather than your dollar donation is fungible with everyone else's dollar donation which has a collective output of benefitting some number of kids. I'd be keen on evidence of this.
I'd also be keen on any research by EA orgs that takes this into account. It might even make sense to promote charities that are not on the frontier for cost-effectiveness, if they can tug on people's emotions better and increase the net amount donated. Has this been tried?