Well, it all comes down to cost in the end. How much would you sell these for? You can get these all over the internet from between $15-$30. If a small jobber is gonna cost more....you wont get many clients. If you are running a huge shop to run off thousands of these.....how long will you hold onto them before that batch sold? That particular piece....is not a common fail item and is generally replaced during an engine rebuild.
For me....I have replaced hundreds of LS engines. Rebuilt only a few. I think I may have replaced 2 of those since 1999 when these engines were introduced.