That, I can agree with....
But let's look at it like this... My cost on that qty of Cooliance sinks will be less than $15 (the first break is at 24pc.)
After buying tapping equipment, and figuring out how to use it, I would require a 100% success rate as a novice in tapping heatsinks on 72 pieces. If it takes me 5 minutes per COB, that's 8 hours worth of work, just tapping heat sinks. That's not including the time it'd take to make sure I've got the measurements right, double and triple checking them, etc. It also does not factor into ease of arrangement of the COB to achieve optimal spread... Now, how much less is the Heatsink USA material? Does that include all the cuts to do it how I would like to, or is that going with no cuts, just COBs on a bar?
If I save 5$ per COB for a total of 360, and each COB takes 5 minutes to tap (let's ignore setup time), that's 8 hours of work @ $20 an hour. So my real cost is down to $200 ($360-$160 for my labor). So, a $200 difference to use a product designed especially for this chip, that is significantly lighter and will make my fixture easier to hang. Wait, now let's remove the cost of the tapping set, let's call that $50 minimum. Now I'm at $150. And that's assuming $15 all the way up, when it will go down with the quantity, so now we're below the $150 difference.
Oh wait! I forgot, you have to sand and grade all of the heatsink USA cuts of metal to get a proper surface... How much time do you think that will take?
Why should I go Heatsink USA and do all that work myself when I really don't have to? Am I really saving enough money to justify spending 12+ hours of prep work?