I made the choice earlier this year to make Epik my 'go to' registrar for almost all of my domain names. I have no political affiliation with the far-right, and furthermore I don't pick my registrar based on politics. I legitimately found Epik to have some of the lowest prices, easy to use interface, good support, and what I thought was good security. The latter of course now in question.
I'm extremely concerned and am actively looking to move ALL of my domains away from Epik. I often relied on landing pages and Epik Marketplace for sales but regardless of how the situation pans out, potential buyer's trust in Epik is going to be at an all time low after this press coverage and media surrounding Epik.
I think it would be a bad business decision to continue trying to sell through Epik due to reputation issues alone, even if it turns out that the hack wasn't as serious as Anonymous claims. The damage to their credibility is done. If further investigation finds that Epik truly did store information in plain-text then they have much bigger problems coming.