Would you invest 2000$ on a 140MH rig? Forget what the GPUs are I'm talking about MH wise, is this a good investment or a bad one?
You are asking the wrong question.
If you are buying RTX 3060 and RTX 3080, then this is a very good offer. If you are offered to buy a 5xR9 390 five-year mining farm, then this is a bad offer.
You will recoup your investment if the farm works perfectly, so which equipment you buy is very important.