Most successful investors I follow seem to promote a refinance event every five or so years to harvest the equity and build their portfolio.

What's the purposes in it?

I am debating on getting a business credit card to separate by personal expenses from my business expenses? Is this a good idea/worth it over just getting another personal credit card from a new company?

This leads into the purpose of Realty Yield’s Investment Property Analysis (IPA).

What would be your purpose in listing it on the MLS when its already under contract?

As long as that account is used for escrow purposes only you are fine. 

Hello, I am in the middle is a cash-out refinance 80/20 LTV for a jumbo loan. My lender is asking for a letter describing the reasons for the cash-out refinance and what I plan to do with the money.

My plan is to i...

Some start a brand new LLC for the purpose of purchase investments and can get loans with no trade lines... again, not prime terms, but it can be done.In terms of you personal experience, it all depends on what you are doing.  

If they are purposely not paying you and they signed a lease that they would then they are not truth tellers.

These will save you on lawyers fees until you get to a point where you'll want to invest in an attorney for lock-tite documents that create corporate veil protections.This is a great bundle which will help your knowledge on LLCs and Tax:https://store.nolo.com/products/nolos-start-and-run-an-llc-bundle-lopbun.htmlMost of these books should also be available at your local library if you want to save on paying for them :-)The biggest benefits in doing your LLC to start will be for tax purposes which a good CPA or tax planner can help you with.PM me and I'll share some docs that I have with you!