They call certain neighborhoods risky or dangerous that they know nothing about. 

My name is John and I was inquiring about your property at 123 Main.For the next several minutes, I was entertained by an explosion of every imaginable cuss word, how I must have been a scam artist, how what I was doing was illegal, and how I was taking advantage of people.

Anything over 30% is dangerous. 

Throwing those dice this late in the game may prove to be very dangerous.

She goes on to say that the accident left her husband disabled and they are in danger of losing it.The space rental is $590.Thoughts?

Highest return on investment, but highest aggravation, is class C multifamily, in not great areas, but not in horribly dangerous inner city areas. 

I am not saying you can't or won't hit that target but making it your base assumption is dangerous. 

. - no doubt, plenty of people use leverage in stocks, and there are real estate investors who own their properties free and clear.They typical is: unleveraged stock/mutual fund investors comparing returns vs. leveraged real estate investors.Also, leverage in stocks is more expensive, at least more than personal residence loans, not more expensive than hard money or other lending options.Options are fun and dangerous - I've lost a few bucks in the past few years buying LEAP's(very long term options - like 2 years) on BP, I can't believe how long that turnaround is taking!  

Demo, especially of old houses, can involve some dangerous materials - asbestos, for example.

Mark,In danger of sounding like a wise guy, what do you mean by "doing pre foreclosures" and "doing short sales"?