I am not sure what are the exact challenges BM faces in this forum but I can suggest you have stake tier based on merit like this .
1 stake for Jr. member but 1.5 stake for Jr.Member with more than 5 merits.
2 stake for Member but 3 stake for Member who earned 10 Merits(means somebody become member by earning 10+ merit or user who was already member at merit system implementation now having 20+ merit will have more stakes than other members)
You can go on creating this chart for all ranks.
BPIP tool can help you to understand that how much merit a user has earned and how much merit was airdropped to user when you click on user profile and you will see the chart of merit of that user that explain current and merit received. Current Merit - Merit received will give you the value of airdropped merit.
If you could know, a BM manager on this forum can face much problems like spamming as bounties board is on of the most spammed from all of them and most number of bots operate there. We have faced situations where people just ruined the campaign with multiple bots.
Still I like your suggestion about increasing the stakes earned to the members who have earn extra merits than airdropped once. As per your suggested distribution of stakes I have managed to put some figures in best proportion to each rank and merits earned.
This is the list of stakes to be awarded according to the earned merits.
Jr.member - 1 stake
Jr.member ( 5 earned merits)- 1.5 stakes
Member- 2 stakes
Member ( 10+ merits earned) - 3 stakes
Full member- 4 stakes
Full member ( 15+ earned merits) - 5 stakes
Sr.member - 6 stakes
Sr.member ( 20+ earned merits )- 7 stakes
Hero member - 8 stakes
Hero ( 25+ earned merits)- 10 stakes
Legendary- 10 stakes
Legendary ( 30+ earned merits) - 12 stakes
Your suggestions in readjusting this stake rewards would surely be appreciated. I am trying to make the process more awarding for the deserved members also it will attract some high merited users to the campaigns.