Right now KDE's donate system is very boring, you just support KDE and it's all, no awards, no patron levels :(
I think that KDE's donate system needs a modernization, the good examples is Patreon and Blender.
Patreon style is more suitable for One-Time Donations or Individual Donations, Blender fund style for various Companies and Corporations.
Donate levels on blender.org:
For exapmle One-Time Donations, why not to make awards for a different donate amounts?
And do the award levels, with some award:
15$ - You will get stickers
50$ - You will get something else
100$ - You will get 3D printed Konqi figure
I think that's good way to do patrons more happy, becouse they're gonna get a awards for their support and their support won't feel like something unnecessary. This also can works much better than just a "shop with KDE attributes".