Good question. Do you know of an investment right now that could earn me close to 6% interest. If so, I am moving my over to that right now! From what I am seeing, the lowest rate is 1.9% on 36 months via FCCC. If you are talking dividend stock, I would do that maybe last year or when 45th took office as I could easily make money; now, with current affairs, not so much. Maybe oil, but 25% of my portfolio is in oil stocks that I bought when (then president) Trump announced that oil was so low that he was filling up the reserves at the cheap price. I always watch presidential addresses with my trading account opened and that stock has tripled since I bought in early 2020. It's the only shinning start for me right now

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That said, I could also take money out of our house, or our lake house which we paid cash for, but I am not willing to risk the money. Comfort vs. stress equation. I am risk averse for sure. Personally, I like knowing that if fit hit the shan, I have a place no one can take away. I am fortunate in that I don't have a desire for tons of money mostly because I have everything I ever wanted without being rich, so I can be risk averse and still be comfortable and happy about my station in life (above the below and below the upper).
If there were a no risk scenario that paid me 3x the loan interest rate, I'd take out every dollar of equity on our houses ASAP. Of course, so would everyone else. in the great words of the old lady in the commercial, "that's not how it works, that's not how any of this works..."
But, get your point and for those less risk averse than me, it's not a bad plan. I was just always taught by really rich people to never finance a depreciating asset. The CEO of a company I use to work for asked me if I could afford the porsche I had just bought. I assured him that I could and he well knew it based on my salary. He said, "did you finance it?". I said, "yes" and his response was, "then you can't afford it" and "if you have to finance a depreciating asset, you probably can't afford it"
So, hope that wasn't TLDR. As I mentioned, my views are shaped a lot by growing up poor. So there's that! Good luck getting your rig.