The GD2 offers special undeatable value. Putting a $20 premium paste on a standard setup is total overkill, it's just burning money. GD2 does the job perfectly for less bucks .
Thanks for the tip!
KPT-8 thermal paste is still commonly used in industry and sells for
$33 per kilogram. 
And for your 20 dollars you can buy a small syringe Arctic MX-7 for 4-8 grams.
I stand with you on this ....maybe paying that much for a tiny syringe just to get around 1 or 2°C drop is a joke when you scale up. that $20 should be spent on the power bill $ or more hashing power maybe ....
I beleive that keeping the maintenance cost down is what actually keeps you profitable. gd2 does just that
I can see you're trying to goad me into a response.
So, let me give you one.
Firstly I don't need to be taking a bath in KPT-8 or any other thermal compound. 1KG of the stuff is insane for a home miner; fine if you're in production and manufacturing thousands of units weekly.
Now, as for the piddly little 1 or 2°C drop its worth having, that drop is the equivalent of 2Watts in losses per ASIC chip.
So with 25 ASICs burning power 2 x 25 = 50Watts saved just because I've used a premium thermal gap compound.
That's 50W x 24 hours = 1.2KW/h not pissed up the wall each day.
That's 1.2KW/h x £0.28($0.38) = £0.336($0.456) saved per day.
That's ~£9.40 ($12.768) per month not wasted or the equivalent of 2 x 4g tubes of MX7.
One tube of MX7 will last me probably 3 or 4 years.
So, yeah, tell me again its a waste of money.