How much are gold first day issues worth?

Answer 1

I hate to tell you, but very little. You can purchase them from a dealer or on eBay for about $2 per cover or even less. They have almost no real gold, such a thin layer that it would take thousands of them to get a measurable amount.

Answer 2

Not much due to the high volume of modern stamps & very miniscule amount of gold used to plate the metal stamp replica.