Whats wrong with LTC mining on GPU's as ASIC & FGPA dont work for LTC 
Presuming you are mining for the purpose of profit, then that's what's wrong with it. There is none (unless, just like with Bitcoin mining, you pay well below average electric rates.)
At the current LTC/USD exchange rate of about $0.07, that means that the 28K LTC mined each day all together produce less than $2K USD per day.
From another thread:
a bunch will switch to ltc (litecoin) mining
Every time I see that assertion I think of this:
With Bitcoin about $80K USD worth of bitcoins are distributed to the hashing provided by miners. With Litecoin that is about $2K USD worth of LTC issuance.
Since each addtional GPU becomes essentially another mouth to feed it lowers the revenue for the other miners. The reason the GPUs will be arriving is because they could no longer mine bitcoin profitably. They won't stick with mining LTC unless it too can be done so profitably.
i.e., it soon will be time to power down your GPU rigs.
I think most people who are going to jump to LTC will do so hoping the price will increase. But then I wonder, if they're expecting the price to increase just to the point it's profitable, why is the price not going up today, when you can buy them for cheap? My only conclusion: nobody cares.
