Research how to advertize to donors the impact of different donation amounts

https://www.nabu.de/spenden-und-mitmachen/spenden/gartenvogel.html

We could do something similar. We need to research better what we could “sell”.

Ideas:

- a mail from helpdesk costs ~6$
- an illustration to better explaine Tails costs 125€

Parent Task: #17078

Original created by @u on 17067 (Redmine)