I don't think the idea behind this are totally stupid, and I don't think having very low donations is even that difficult. I agree that if every transaction made was 10c the tax the transaction fees would make it pretty ridiculous, but only if those transactions occurred across businesses. The simple answer could be to use credit.
Every user has a piggybank stored on the server, when they want to make a donation they add credit to their piggybank from a paypal/visa account with a reasonable minimum sum, lets say $10, they then have maybe $8 credit (10 - taxes and transaction fees or whatever) and the real money they transferred is moved to a bank account owned by the service.
Portal fee,bank account owned by the service fee,fee shared between portals.
This system exists already. There's an example with AfreecaTV. People buy star gift package (a star is a currency there)and then gift em to their favorite broadcasters , which then can be exchanged into money. (fees going to Afreecatv ).
-system works fine for already popular people ( tv people)
-system works fine with naked girls (boobs)
-system works fine with violence (broadcasting people hitting each other or doing weird stuff)
-system works fine with a few talented people
People willing to pay are paying for shocking value and mostly in exchange of something.
(controversial parade in korean news)
i don't see how a similar system would go cross different portals. especially for art, photos, devlogs, texts.
The easier you make a system to share money, the easier it is for malicious people to abuse the system.
Shoq pointed out that it exists already and no one even talks about it.
when money starts to circulate, everybody wins
Only the top wins.