Campaign rates go down quickly and up slowly. Participants have to accept that. I do not like the idea of pegging rates to usd because this undermines bitcoin as a separate "currency".
This is bullshit. With this attitude you will always be someone's else bitch. What you do is push them to raise rates, and they will forced to do it or else they will not get any advertisement.
They offer their rates, you don't like their rates you have the choice of leaving the campaign. If their rates is indeed too low, no one will join their campaign. Then owner will have to increase rates. While they still have participants in the campaign, they have no incentive to increase rates.