Technically there's no difference between the 60 points, who ever you're getting it from.
The difference is from the other player - let's say you have 2 options:
Herbie and a 400k forward vs
Hudson Young and a 400k centre.
Due to the (generally) more consistent scoring by forwards you are far, far more likely to find a 400k forward that can hit 50+ scores vs finding a 400k centre that will do that.
Of course, the challenge is trying to find the right 400k forward, but I generally find a lot of forwards who move clubs do so for a better opportunity - more minutes, better attacking team etc, so they can increase their value substantially, while centres are generally playing the full game usually, so from year to year, even if they change teams there's very few who improve their overall score by 10-15 points.
That's the way I see it anyways
This is an amazing answer
Herbie and a 400k forward vs
Hudson Young and a 400k centre.
For my choice it is
a) Herbie and Tallis Duncan or
Leka
or b) KL Iro and Toby Couchman
If they all average the same as last year it looks like this
a) Herbie 63 points each week plus Duncan 43 points = 106 points each week
b) KL Iro 49 points and Couchman 54 points = 103 points each week
This is pretty close but slight edge to Herbie
Here is an optimistic forecast
a) Herbie improves to 68 average - Duncan actually gets lots of minutes and averages 50 = 118 points
b) KL Iro improves a bit 53 average and Couchman goes at 60 which a lot of people expect to him to = 113 points
This is edge to Herbie
Here is a rainy day forecast
a) Herbie gets less pill this year and drops to 55 average Duncan stays at 43 average as I don't see him going lower = 98 average
b) KL Iro falls down to earth with 45 average and Couchman sticks with 54 points and doesn't improve this year = 99 average
This is basically a draw.
Conclusions
* Based on last years averages better off with Herbie
* If Herbie pops off better off with Herbie
* If everyone levels off then neutral Couchman vs Herbie
Crystal Ball What will Happen? Which scenario will happen?
Maybe it is appetite for risk like Fizurg said - if you want to build for a scenario where Herbie "only" gets 55 points or even less then don't take him
If you want to take a high risk that he pops off and averages 68 then do take him
According to those scenarios Herbie needs to average 63 again for the maths to make it worth taking him at 800K. I don't think it makes sense to take him for $800K on the grounds at least he will score 55 - because if he only scores 55 you can do at least as well with a forward and a secondary centre like Kiraz/ Iro/ Holmes
I agree that taking a 400K centre doesn't make sense. Either 250K centre or high priced centre.