This idea help on reducing selling pressure on bitcoin market if weekly payout from campaigns reaches exchanges on regular basis and in significant percentage.
Bitcoin is different than thousands of cryptocurrencies because it is decentralized, no censorship, no price control. There is manipulation on the market but doing artificial price control like this proposal never existed.
Your proposal will be favorite by altcoin teams who want to create honey pots like staking pools, and attract token investors to lock tokens in these pools. It's one of their policies to reduce selling pressure on the market but token price continues to fall with time. The example means this proposal can not work well practically.
Also, this may help on reducing spam in this forum because people who treat campaigns as income source may move on.
So in future, we will have a new use case for Bitcoin, reducing spam on bitcoin forum or any cryptocurrency forum that apply this proposal, that is strange. I disagree with the proposal because spam on any forum is not related to Bitcoin and it is not responsible for spam reduction or spam control/ moderation.