783k for max rank.
It's absolutely unbalanced. You can get 8k merits for a full Cutter of agronomic treatments, but for 8k I would need hours of bounty hunting.
FD is following the PP1 pattern of spending credits to deliver PP goods to earn merits. I used to deliver propaganda material for Aisling but only the first few tons were free. You had to spend credits to deliver more.
The higher you rank up, the greater the weekly allowance but it was never enough to avoid spending your own credits to rank up faster. Consequently, you spent your PP downtime doing non-PP stuff to keep ahead.
In many ways, the PP 2.0 system is better but they do have to rebalance the rewards from the looks of it .