My philosophy is don't get greedy and no one ever went broke from taking a profit.  

I believe a lot in philosophy, and as the clique goes "everything happens for a reason".

We believe in Kaizen (Japanese philosophy for continuous improvement) and CANI (Uncle Tony’s take on continuous improvement).The real estate agent I work with is the best.

My personal philosophy is to continue levering up while I am in my 30's and 40's.

The question is tough to answer in absolute terms, because every PM is working in a different market segement and has a little different philosophy.

I will definitely go in with the same philosophy for those who applied without seeing the unit and meet with them in person as much as possible as well. 

I've heard David stress that people shouldn't emphasize cash flow as much in today's market, and the market I'm in, I feel, embodies that philosophy.

If you are talking about 1-4 unit properties, yes a rehab could possibly get you in a situation that you describe but that is a personal investment philosophy decision.

I've contacted a few lenders, and they do have ceilings in place for their variable HELOC loans, but they are very high (15%+).For those who have HELOC'd to fund rental properties in the past or believe in that philosophy, do you still believe it's a good time to do so?

Most DIY landlords in my experience do not have the right philosophy on building true wealth through rental property ownership.