Off-market sellers that list as cash buyers only

[Angelo Pompeo]

Hi, just a potential new investor here. 

I'm doing some property research and I notice a LOT of the sellers in off-market list as cash buyers only. I'm trying to understand what that is and why it matters so much.

I assume it means if I have a private money lender or some kind of pre-qualified loan, they aren't interested. Is that correct?

If they get paid either way, why would they care if I was buying with a loan vs straight cash? Is there a degree of uncertainty a loan brings that I should be more aware of? 

Thanks in advance!