I am lucky to have a good wife and a good rich friend who has helped me for over five years for paying, among other things, for my private nurse that I have had for over five years.  

We were able to to both retire early - my husband at 58 (from Shell Oil) and me at 59 (Nursing Professor).

I am currently in Boston as a travel nurse but when I visit Philly, I will definitely join a group.

However I do fall under the lower income exception.I rent half the home to traveling nurses who are booking for 3 month stays at the moment.

You'll always be competing with every retired nurse and stay-at-home mom and every other guy with 40 hours to take the class.

Many of these seniors are still living in SFRs, while some have moved into multi-unit nursing homes and assisted living facilities.

I'd also focus on markets where people really want to be, and are relocating to, as I don't think the traveling nurse population is nearly as large as advertised, nor stable and reliable. 

You could look into possibly doing an MTR (medium term rental) and cater to travel nurses if so.  

Another is graduating in the Spring with his BA in Drama/Theatre, another is starting Nursing school, etc...

Currently putting her through her Nurse Practitioner master's degree (this means a good deal of our income is paying for her school currently), after which am seeking to continue investing in passive real estate with the idea of building a large portfolio of residential and perhaps eventually commercial real estate as time goes on.I'm looking forward to networking with you all and learning as much as I can, and hopefully giving back to others in my own way as well.