If they were really interested in the (financial) success of their readers, they would try to educate them just that instead of trying to milk as much money from them as possible.

HUD only requires a year and a day for owner-occupiers, so you can recycle your cash, build equity, cash out, and repeat every year or so - a great way to accelerate your growth.

I imagine that for most vacant houses, the garbage, recycling, and green waste bins are not moved to the street once a week on the relevant pickup day.

It's very doable, but if you think "I have 50k I'll keep recycling it", you'll be going pretty slow if you don't find other funds (which may be fine if you want to do 1-2 deals/yr). 

Grocery stores charge more for milk on Tuesday than they did on Sunday. 

However, the BRRRR strategy (buy, rehab, rent, refinance, repeat) makes sense for a lot of investors, as value can be created through forced appreciation (renovations) and capital recycled through cash-out refinances.