Besides being worried at adding complexities to my properties, I genuinely don't really know what people want, because when I travel I'm not spending the kind of money that people are obviously spending at these ultra high cash flowing properties.

Some strategies to lessen the negative cash flow are: house hack and rent out the other unit as a mid-term rental (to traveling professionals or for people temporarily displaced because of insurance reasons like fire) or short-term rental (business or vacation).

As Kevin points out, traveling nurses make good money, and their employer pays for their housing.

@James HamlingHappen to be doing a lot of travel in Europe the last 3 years.  

Bad news travels fast. 

Make sure you have smoke and CO detectors in appropriate places, GFCI outlets near water, functioning mechanicals, make sure everything is in good condition and you shouldn't have a problem.

I found out that was all smoke and mirrors.

Traveling Mailbox is a great value. 

They are even featured in articles, have been profiled and interviewed in the local media outlets, look really good online etc. and have a reputation around town as being highly successful because they have been busy buying a lot of units and making themselves look successful even while doing what I would consider very bad deals.It's smoke and mirrors. 

They should become like current-day travel agents: far fewer than pre-Priceline, but well-compensated for arranging high-dollar, complex trips.