i am not certain about it, but i think there were a change in profitability algorithm that it does not change coin until it find a block of it. This method is useful in some situations but not useful when there are more easier and more profitable coins out there in that time.
as i said, i'm not sure about this statement, maybe i am wrong.
That's actually a pretty smart idea, on the whole.
The problem is nova coin specifically, I know from mining on multipool it takes forever to get a block sometimes. For a pool this size, LTC can take a while too.
I think the variance is just too high for novacoin with our hashrate. We can go at it for hours, maybe a whole day and not get one block. Sometimes I just like to hop on middlecoin for 12 hours at a time, guess I can't do that anymore.