* Consultancies that improve marketing campaign efficacy make lots of money
* HN users are making small fractions of that money and constantly complaining about it
* Any HN user capable of picking this low hanging fruit could do this for two years and retire for life
* They are not
* Conclusion: Either there is no low hanging fruit, or the HN users observing this are making millions of dollars, or these HN users do not care for money at all and get greater utility from complaining about money.