The closer to gen. parts get, the lower the price of OEM will be.
I give you an example, at least from my point of view.
Unless you're a millionaire sitting on a minimum of $3 million in savings, It's wasteful, inefficient and financially stupid to pay $7,000 today for a Fiddy case set to build a Franken watch.
It's equally wasteful to pay +$2,000 for a gen. fiddy crystal and flush it in a replica case when aftermarket sapphire crystals with gen. Specs are selling in the $150 range. Especially when you know that early runs of Pam crystals had the same distortion you see in today's reputable reps.
It's wasteful to pay $900 for a gen. 111 dial and flush it in a replica Case when LH is offering a 99% identical one for 20% the cost.
It's wasteful, gullible and financially unsound to pay $2,500 for a Pam 217 case back to exhibit an Asian ETA,
when Jakob forges a 98% close
To gen. Case backs at 10% the cost.
Some prices are really over inflated..
The only gen. Parts Id be Interested in would be the movement, and sometimes the CG.