What are the differences in quality between a gibson and custom gibson besides the 1k price difference?
Items on the guitars are different or swapped out from the standards.

For instance go look at the Slash inspired LP

Then check out the LP Standard

Different pickups, hardware, finishes, etc. In general, because they make fewer of them, and because they use better/different/upgraded items on them, they will cost more.
The only thing different is really the quality of the guitar. Either way it's way overpriced for what you get, you could get a completely custom, handmade guitar for that price.
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maybe you're not saying the right things? an amp likes to know you care.