The Forge Domain cleric's Artisan's Blessing Channel Divinity option (XGtE, p. 19) states:

You conduct an hour-long ritual that crafts a nonmagical item that must include some metal: a simple or martial weapon, a suit of armor, ten pieces of ammunition, a set of tools, or another metal object [...]

 

The thing you create can be something that is worth no more than 100 gp. As part of this ritual, you must lay out metal, which can include coins, with a value equal to the creation.

I understand that it may be ambiguous whether or not I could make a pile of gold, but a gold bar should work just fine.

Is there any reason I can't convert used weapons into gold bars, to receive 100% of their market value?

Are there any rules that indicate that selling a gold bar results in some kind of loss in value?

The Forge Domain cleric's Artisan's Blessing Channel Divinity option (XGtE, p. 19) states:

You conduct an hour-long ritual that crafts a nonmagical item that must include some metal: a simple or martial weapon, a suit of armor, ten pieces of ammunition, a set of tools, or another metal object [...]

The thing you create can be something that is worth no more than 100 gp. As part of this ritual, you must lay out metal, which can include coins, with a value equal to the creation.

I understand that it may be ambiguous whether or not I could make a pile of gold, but a gold bar should work just fine.

Is there any reason I can't convert used weapons into gold bars, to receive 100% of their market value?

Are there any rules that indicate that selling a gold bar results in some kind of loss in value?