In my opinion, the members involved in the campaign should be limited. Because the project gift supply is not available to unlocked members. This has led to the release of a few campaigns due to unlimited participation. I once considered this in the campaign.
If you check the services section's btc paid signature campaign they are already have few spots only for the campaign participants there I hope we do not need any regulation at there. If want to reduced the number acceptance means they should done that on bounty campaign.
Since the free spreadsheet application there are people just applying in 1000s in numbers.
Manual acceptance has been done with checking the post quality means we will find the quality posters for the forum and no tons of members in bounties.