I totally agree on the limit on members participating on a campaign to curb spam and enable a larger allocation of tokens to be given on a bounty and of course it will mean more work for the bounty participants,but I don't mind since an increase in the allocated tokens are certain.
Limiting the members of a campaign will make the quality of the job more secure and the testing of the campaign manager easier, I am very supportive of this. Without limiting the number of members, there are many campaigns with too many members and that leads to poor quality of work and difficult management.