I think there should be one or two lower levels with an affordable price but with limited benefits and the premium/highest rank should be no more than a bitcoin or so (and be pegged to fiat to avoid what happened with the current donator ranks). Even having it as something around $100 would still be a significant investment for most but any amount will take the money away from farmers and make people take better care of their accounts.
I agree, but I think that maintaining the current donator levels is somewhat of a priority.
We could keep the VIP/Donator ranks as they are but separate from the new ones. Nobody is going to donate at the prices they currently are (unless bitcoin ever tanks) so maybe it would be best to 'retire' them (though you would obviously keep your title and benefits). Previous donators could also be automatically promoted or have the benefits of whatever the highest new rank is as well.
Keeping the 80% step down and having separate levels makes a lot of sense to me. Perhaps along with the addition of a 2 BTC Supporter level with a slightly restricted signature, a 0.4 BTC Believer level could also be introduced with an even more restricted signature. It could even be announced with enough lead time to where current signature campaign participants could save their funds for a couple months to pay for their account upgrades if they wanted to continue advertising.
I think a balance would need to be found. They need to be affordable and worthwhile donating for but not so cheap it's affordable to buy on your 20 multi-accounts. Nobody is going to donate for something that is going to take them a year or so to see a return on investment so the benefits need to be there for them to donate in the first place. There could just be one donator rank, for say $100 (or whatever), which would get you a Hero-sized signature (plus other benefits/perks) or you could have several ranks starting from a small amount ($5-10 or so) and going up in a tiered scale. Things might get complicated or be hard to code for numerous ranks though but having one expensive/ premium rank might price most people out of it (which has positives and negatives I guess, but like I said it's about finding a balance and where the positives outweigh any negatives).
All this assumes that 1) there is a desire to reduce spam on the forums
Of course, and this is something the Staff has been discussing for some time and is why I suggested what we're talking about now. theymos expressed interest in it a while back as well so it's certainly a possibility, though would likely take quite some time and effort to code but I think would be worth it. It would be a significant money-earner for the forum whilst having the added benefit of stopping account farming which is always going to be a big problem as long as signatures are tied to ranks.
& 2) theymos wants to spend more of his free time on forum fundraising efforts.
I don't know how interested theymos is in generating extra income but once the system was coded it probably would be automatic and run itself but if it required any manual intervention the other staff could handle implementing the new ranks to users by whitelisting or whatever after they donated. Even if the forum still doesn't 'need' money it can be saved/invested or donated to charity or something.