Why should the forum change its requirements to conform with some random bounty allocations?
You can read bounty as "Activity" then.
When we says Jr.Member are spamming for signatures then activity based merit system will just discourage them to go on creating multiple accounts.
Anyway I guess bounty stakes basis was "Activity" only.
If you agree Signatures are cause of spamming then you have to create rules that can effectively counter it and it is not equivalent to "forum change its requirements to conform with some random bounty allocations"
Increasing the merit requirement for jr. Members without making any reductions anywhere else is the way to go.