Is this LEGO set still sought after by Technic builders?

Yes, as a specific component pack from the 2008 Technic theme, it is valuable for completing older builds.

What is the original release year of this pulley wheel pack?

This set, 970018-1, was released in 2008.

Name: LEGO Gray Pulley Wheel (Pack of 50) (970018-1)
Brand: LEGO

Technic

Technic · 2008

Theme · TechnicPieces · 50Set Number · 970018-1Year · 2008

Used

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New / Sealed

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Is this LEGO set still sought after by Technic builders?: Yes, as a specific component pack from the 2008 Technic theme, it is valuable for completing older builds.
What is the original release year of this pulley wheel pack?: This set, 970018-1, was released in 2008.
How many pieces does the LEGO Gray Pulley Wheel pack contain?: The pack contains 50 pieces.