Because mining ETC yields less than half the profits. Mining ETH is still most profitable on the 4GB. I got a few running on that lolminer but it runs at 24MH/s. Every DAG the speed slows down by 1 MH/s per DAG, most likely going to use for another 2 weeks and just craiglist the GPUs.
Nothing really worth mining with 4GB cards anymore. There is KawPow which yields like $0.25 after 10 cent power costs. ETH profits are almost triple of that. Then there are days when the fees are high and you can easily make 50-100% more profits.
Just sad you cant mine ETH anymore on the 4GB cards.
Funny, for the past 2 years prior july eth has been in negative profit, $0.10 per day per 30mhs net would have been great on those past 2 years but it was not even that, now on the bullrun that is just not good enough hehe, people are getting spoiled again. I agree with you, do not bother using them to mine anything else because as we know is not worth it, better just sell those 4gb while you can get a good price for them, there are gamers that want them, you will be able to sell for $100 ~ $150 easily.