Scrypt mining on GPUs is not profitable for last 4-5 months and only way to make ROI was to mine the newly launched coins and sell them on exchange faster. But there is shortage of good coin releases lately and ROI on GPU is much more difficult.
Sometimes it is better to wait for pump and then sell all coins. Also I was trying with renting huge amounts of power via nicehash so I made instamine and have a lot of coins at the beggining.