Rent reduction for quality tenants is not something that would be expected in our market.

It's 3.5% cost of the total rent transaction, or as @Scott Weaner was indicating, it is 14% reduction of net profit if you accept a $1000 payment by credit card.  

Whereas typically subordinate Helocs (or even 2nd lien helocs sitting in 1st position) are some of the first credit “fat” to be cut.

I would talk with a tax professional to look into other tax reduction strategies that work for house flipping. 

If you're still worried get a parent co-signer, or fat damage deposit.

It's funny because the only people who ever argue with me about the commission reduction not being tangible are real estate agents because they have a vested interested in the outcome. 

FOLKS Demand that that thread includes @J Scott's explanation of how $1, 000 financed on a $1, 000, 000 property  @ 15% results in a $50, 000 reduction of NOI!!!!   

Or, when the fat pig sings & flies.

We see a lot more price reductions now on MLS - sellers have been over confident and pushing it too far.In every market you have what I call seasoned buyers: they have been looking for a while maybe made an offer or two.

The answer is a big fat NO.