Cryptocurrencies mining rig on rent? RIG vs CREDIT

Hello dear steemiters,
I present to you mining rig for credit. Read post before you comment that the price of btc changing with each second passed. Let's assume that the price will stay on one level. Here i got some calculations of this idea.
Cost of mining rig:

Our earning from mining eth:

Of course, I only present you the idea of mining rig on rent.
Tell me what you think about it in comments.
Much love from me.