I think , you should test the formula first in some random samples.
Name: soniclord
Posts: 1997
Activity: 1092
Merit: 1002
Position: Legendary
Date Registered: April 05, 2015, 07:12:51 AM
Last Active: July 16, 2018, 03:21:23 AM
WoP = (Merit + 1) / Posts x Activity
=(1002+1)/1997*1092 =548.46
By your formula,soniclord is more worthy poster than all of the below quoted.
jgarzik: 481
OgNasty: 477
Gyrsur: 408
marcus_of_augustus: 402
mprep: 385
Hal: 368
Dabs: 340
Vitalik Buterin: 307
QuestionAuthority: 276
-ck: 272
Vod: 243
Vlad2Vlad: 167
hilariousandco: 110
philipma1957: 101