@Jordan Rhoads
Well, but here's the problem on the flip side. most banks/credit unions don't lend for properties worth less than $50k (or some banks loans under $50k) so you still need the property to appraise at least around $70k-$75k or so. Which means you need to find a property that you can buy and rehab for around $50k so you can pull out all the cash and do a successful BRRRR. But hey, what if you spent $60k and it only appraised for $70k? effectively, you've still purchased the property with 0 money down since you used heloc to fund the $60k. It may take you few months to pay off the heloc because your cashout out refi won't cover the entire heloc payment, but you can pay off the remaining over few months using the property's cashflow, and after the HELOC is completely paid off now you can truly cashflow after paying off your bills like mortgage/taxes/insurance, etc. It just delays your start date of cashflow, but you are still buying the property without using your own money. You are 100% financing the deal.
BRRRR is great when you have cash. If you have HELOC its better because you aren't using ANY of your cash to buy these cashflowing properties. You can always 1) cashout refi after rehab is done, 2) pay off HELOC as much as possible using the cash, 3) refi again after few months since now you have lower HELOC balance and thus you can get better rates. Yes it will cost you double closing costs, but you will get access to cash faster to look for next investment and hopefully you will get even more cashflow from that 2nd property to cover all your expenses/mortgages.
i will say it can also work against you though. things CAN go wrong and you CAN lose money. you want to make sure you have enough reserve if things do go wrong you won't be left with a worthless property and a lot of debt you can't pay off. Like @Dave DeMarinis said, having the reserve is essential, especially in the current environment with lots of uncertainty. As much as you hear all the success stories here on BP, i'm sure there are 20x more landlords who've failed and given up in the real world. invest smart, do a lot of due diligence, and when the numbers are right don't be afraid to jump into the deal.