Ask seller for allowance to avoid putting money down

[Ben McPhail]

I am looking at purchasing a home for 70K. Rents for $900. Cash flow after PITI and property management would be about $350 with 5% interest. I was thinking about offering 86K with a 15K allowance to avoid paying down payment and it would cut cash flow to $200. Assuming it appraised high enough is that a good idea?