Maintaining your own staff means you have to carry workmens comp insurance,  have payroll taxes, and payroll accounting to do (or outsource). 

See if you can automate or outsource the most time consuming tasks to free yourself up to find your next deal.

I have 2 multi-families next to each other; it is a god-send.If you are aiming to "go big," I agree with the "guru's," in that you should outsource much of the day to day; it is hard to go big in Westchester due to the high cost of living/property.

This tells me that the people on the site are outsourced people likely from outside of the county and they work on volume.

High cost of entry, but the business part can be outsourced.

As much as you can outsource activities, there are many decisions which will either enhance or destroy the returns.

Properties like this usually trade at higher CAP rates as they are a bit more time intensive on the management side and not easily outsourced. 

Do you outsource via a service or do you just pay folks you know to do this for you?

Everyone is different, but I prefer to have the stable income coming in, the ease of getting loans, and being able to outsource the stuff I don't like doing.

Some investors choose to outsource that, others do it themselves.