Compared to other services that might offer lower-quality leads or require higher upfront costs/paywalls, Prime Tracers also give you free lead credits on sign up so you can actually see the results before you commit to a purchase.

It will likely still continue being a difficulty.You mentioned bills, are they credit card bills?

If someone injures themselves and sues, they will be suing the LLC and not you personally.

Buy it personally, and rent it full time to my C-corp?

Once you start processing the credit/criminal, the money is spent, and you can't get it back.

To Sum it up, its a good idea if you can exceed the cost of capital (higher rate than your cost of debt) with what you earn on your heloc/debt you pull out and invest.The question is how much gains above is enough to substantiate the risk of your variable interest rate, well thats up to your personal investing criteria.

Liability Protection: An LLC provides legal separation between your personal and rental property assets, which can protect personal assets if a lawsuit arises.

I do not personally originate loans.

Then what happens is the lender reports your payment history to the credit bureaus and each time hereafter if you ask for another loan and the lender pulls your credit then they are going to see your payment history and whether you made your loan payments or not which will likely influence whether or not they lend you money. 

They could even hire you to do the work on the house and instead of paying you they could just give you a credit at closing.