Traditional financing, or pull primary equity and pay cash?

[Jacob Lewis]

Hi BP.  This is my first post.  I have seen a couple questions similar to this but can't find the exact one so I'll go ahead and ask it:

I'm looking at making my second rental purchase for about $60k, which with traditional financing is maybe a $45k loan, $15k down.  Aside from it being difficult to find a lender for so small amount, it being an investment property it comes with a higher interest rate and higher closing costs than if it were for my primary.

Since it is such a small amount I could just refi my primary to pull the cash out (I would end up with about the same interest rate as I currently enjoy), have a lower interest rate and almost no closing costs and pay cash for the investment.  

I don't know why but something feels off about mingling my primary with my investment properties, even though I know the liability and tax is all the same anyway.  The only reason I could really think of not to do the refi is to keep the option open in the future when maybe traditional financing gets harder due to owning more rentals.  Anybody have any other reasons not to or other ideas?

Thanks!