However the -new- upcoming Avalon 1,9GH Scrypt miner @1700 watt does only make 1 dollar a day right now.
They key thing you said is "right now". Crypto is hitting historic lows this week, so you are looking at the absolute worst possible mining revenue right now. In a week it could be making 3 times as much, you just never no. Making a decision or forming an opinion based on a single snapshot of profitability is a mistake.
Even if that's the case it makes more sense to buy ltc directly. You will get 5x more ltc over what that new miner can generate over it's lifetime