The thing is, most people have switched to mining litecoins with their gpus due to their easier difficulty and lack of ASICs. So if you arent one of the people with rigs dedicated to mining, you should probably mess around with litecoin.
You're probably right that mining alt coins (litecoin) is more efficient for GPU miners, but many newbies just won't be interested in the added complication. Personally I can talk to friends about bitcoin, but with alternative coins it starts to become tedious. For many people one cryptocurrency is enough. For me, you're right, I should probably switch.
mine LTC and dont convert to fiat...convert to BTC.