I suppose if you're making more than your electricity spend, it's financially worthwhile to mine (you can always sell the card later too if the price calculus changes to not favour you later)
Though it remains to be seen if the Eth Classic price will hold up with a lot of new, constant, sell pressure from miners. If the influx of miners greatly outnumbers other users, the price will likely go into a dive, until miners no longer can mine ETH classic profitably.
Then, it's likely many (the ones who don't care to speculate on future price appreciation) will either try to find a different chain to mine for, sell their cards, or store them for a point where the tide price/hashrate shifts to make mining worthwhile again