a $500 glock
+ $2500 worth of gold plating and engraving
= a glock nobody will pay $3000 for.
It appears to be good engraving, but not any better than what you might find on a well-made revolver, such as a colt or S&W.
It's like putting a $4000 custom paint job on a 1992 toyota corolla. It looks fancy, and you can use it forever until it wears out, but it's really not an investment. You'll never get out of it what you put in, and you can't take it off and sell it.