Tons of reasons
1. To produce Pregnenolone; hCG activates the p450 side chain cleavage (p450scc) enzyme which converts cholesterol to Pregnenolone
2. To produce the precursors for DHEA, Estrogen, Cortisol, Testosterone and DHT...back filling the pathways (See #1 above)
3. For proper and normal brain function
4. For proper functioning of the testicles
5. If men ever want to restart
6. If men ever want to have children
7. If men don't want balls that end up in a small mass of useless Collagen
8. The list goes on...
In short, hCG keeps the testicles functioning in a normal state and supports all three androgen pathways. It prevents pregnenolone deficiency and supporting all our other CHOL pathways and hormones as well.
There's lots more info out there.
Here's a medical study from the NMJ (Chonnam Medical Journal), that touts all the advantages and even found those taking HCG had longer dicks. lol. I'm not kidding.
Penile Growth in Response to Human Chorionic Gonadotropin (hCG) Treatment in Patients with Idiopathic Hypogonadotrophic Hypogonadism
Maybe your hung like a horse, Roush.., but I'm doubling my HCG and hanging a small weight on my dick!!