In the last two weeks I had 9 houses get sniped away by either higher offers or cash bids. There are two different parts to a cash bid that can affect how a buyer compares bids.
1. More likely for the transaction to be completed.
Here's what can go wrong in a financed offer: Property doesn't appraise. Interest rates change. Appraisal gets delayed. Inspection gets delayed. Insurance can't be found. Small discrepancy on credit report can't be validated. Buyer loses job. Buyer changes mind. Storm damages property.
Here's what can go wrong in a cash offer: Buyer changes mind.
For that reason, I've seen cash offers that were lower win.
2. Speed of the transaction.
Lenders are notoriously fastidious home buyers. They want it inspected, appraised, and they thoroughly vet the borrower. I just sent twenty pages of shit to my lender yesterday, and today they asked for another twenty. It's not a big deal, but it takes time for all the pieces to happen. A day here, a day there.
A cash sale can happen at 2:00 if there's a signed contract at 1:00. Cash sales can happen so fast as to be instant compared to financed. Time is money, and if the seller is ready to be done (like a many months vacant rental property) then it's potentially a couple thousand dollars difference just in expenses between a cash and financed offer, even if the face value is the same.
If I had the cash on hand to make cash offers, I would. You can then choose to "buy it from yourself" and mortgage it if you want to, with all the time in the world to get all the different things done.
Many sellers are only going to look at the dollar amount of the offer, but cash puts you in an incredibly strong position, and greatly simplifies the calculus for the seller. It's also a motivator in general, I had a friend that had his house listed at 240k for about 8 months, he turned down a ton of offers at 220-230k, someone stopped him on his driveway and offered 210 cash, they haggled up to 217, and he took it. From the driveway on Tuesday to sold on Thursday.
What I ended up doing to compete with the cash buyers was offering more for the option fee and earnest money. I just doubled what the "traditional" amounts are, and made sure to indicate that I was a pristine credit investor to the extent I could tell I was buying from another investor (buying from a L.O.L. I am a young single just starting out...).
Cash is King though.