If you think that it's enough to qualify as digital gold, then Pokemon trading cards are also digital gold. Or World of Warcraft's currency.
I agree with this, not just Pokemon trading cards but also some valuable ingame items from different esports games right now, there are tons of items that cost hundred and thousands of dollars. Anything rare in the digital world can be considered gold if it still has the demand from the market.
Even if it were rare, that is not where its value comes from.
Yes bitcoins value doesn't totally came from its rarity, but bitcoin being rare surely contributes to it's value even by a little percentage. Having a limited supply and high rarity will cause the people to put high demand on it and eventually price will surely go up as long as the demand from people is there.