Regarding submission to NGC or PCGS, you may have a local coin dealer who can submit the coin for you. That way you wouldn't have to pay the membership fees, though you'd still have to pay the submission fees and probably a small fee to the dealer for the service.
Quote:
do coins increase value on the collectability or purely on the gold content/price
It really depends on the coin and the grade. While gold spot price would be a baseline on the pricing of any gold coin, the actual value will depend on rarity, grade and market demand.
Member of SPMC, FCCB,
ANA and ANS.
My U.S. Classic Commemorative Complete Set:
https://www.NGCcoin.com/registry/co...sets/278741/My U.S. Fractional Note Set:
https://notes.www.collectors-societ...eSetID=34188