i'm just making numbers up, but if your rent on a property is $1000 and your all-in cost is $1500, and you're negative $500 a month forever, that doesn't make sense, even if you can afford to cover the $500 with cash from another income source.i also agree with not using up all your cash, but that just means you might need to wait and save up more cash. 

Sounds like the person you asked is projecting their prior negative experience with duplexes.

I am looking to connect with the investors there as the promotors are continuing to take Asset Management fees to the tune of $450K a year (on top of PM fees) even when their payout to the investors is around $20K a quarter (not meeting preferred) and the overall fund is negative about $450K.

My concern with declining values, increased inventory and a weaker economy would lower rental income and could potentially put me into a negative cash flow situation.

Assuming 7.5% interest rate, the negative leverage would require you to put way more than 20% down just to break even.  

Each path has its own positives and negatives, strategies, and options. 

However, longer-term bonds (1-5+ years) are subject to interest rate volatility:If rates rise, bond values drop, potentially leading to negative net returns.If rates fall, bonds appreciate, but gains are capped by their fixed coupon rates.While Treasuries provide stability, they offer limited upside and carry hidden risks for medium- to long-term maturities.Why Real Estate Is a Stronger Option in Today’s MarketMultifamily real estate, particularly value-add properties, presents an asymmetric risk-reward profile that Treasuries simply cannot match.

Basically wholesaling would've been the best but there is alot of negative comments about wholesaling this days.So what is the best way to make small income with $0 from realestate and also grow along the way?

if you do it right, you'll break even.not trying to be negative, just realistic.

Most will be negative because they have had bad experiences with it.