if it is easy for delegates to see who voted for them, why won't each voter gradually drift toward the delegates that give them the highest immediate cash in return, even off-chain? this seems like an existential threat to the system, it dampens the idea that DPOS will be a force of nature, and weakens the power of decentralization by vote.
https://bitsharestalk.org/index.php?topic=5868.msg78966#msg78966
POW has the same problem. We should ban "pay back delegates". It is not perfect but it works for Bitcoin. There are also no pay back mining pools.
I think it might not be a problem if all shareholders that vote are educated enough that such voting behaviour harms their assets / the network they own and that (probably by far) is a bigger loss on average than the tiny gains through paid back tx fees. That is how I think about it right now. But please feel free to discuss it! I tried to spark of a solid discussion there but no one really talks about it...
you should only ban what you can enforce. Can you really enforce a no-pay? Whats to stop people from paying for "marketing" and it goes to a mass sender going out to their secret backers?
If one delegate is beginning to prove his marketing efforts it will pressure the others to do the same.
I meant a "soft ban" = discussing it, educating people that the personal benefits for them are tiny but the potential harm to the network can be big which harms them a lot as they are shareholders. "Ban" is maybe not the right word. More something like a "social ban". This seems to be against crypto principles but the byzantine generals problems has not been solved by anyone in the space yet. POW, POS and DPOS all have the potential for centralization and it can not be avoided solely by technical means (up to now, lets see).
The problem with a "social ban" is you leave the option to pay for votes only to users already willing to ignore the social norms. So you take away the quite useful tool of compensating your supporters from those who are willing to follow your rules, which makes it harder for "good" actors to succeed.
So again, I'd really discourage the "banning" of tactics that are actually able to be banned, and don't rely on people following rules. Good people will follow rules to their detriment, bad people will ignore the rules because nothing makes them stop and they'll have an easier time onboarding support because they have a tool in their arsenal those following the rules do not.