Interesting project but I have few questions. If for example the art is priced at this x amount of artcoin, exchange happens and artist gets x amount, then suddenly artcoin price at the market goes down, then artist feels his work is devalued? And problem with eth is scaling issue and gas price. Have you considered using waves? Im interested yet curious.
Just because the value of Ether goes down does not mean the value of Artcoin will go down. That is, if the price of the currency is expressed in ART/USD. In the scenario that ETH/USD declines and you wanted to make a trade of ART -> ETH, it will always just take as much ETH as necessary to == that amount in USD. Hopefully that makes sense.
I don't necessarily see Ether's current scaling issues as a long-term challenge to the project.
Disclaimer: I am the technical co-founder of the Artcoin project.