I think they are definitely not perfect and have growing pains and 'headwinds' they face with that growth.

I only sell if it is causing pain, I feel that asset value has peaked or I already have specific opportunities that are better. 

We have a tier two lender in which credit matters even less BUT WHENEVER you hear that statement, rates will be much higher along with the pain.

I have no issues investing my own money into my properties, but its a pain to use almost every last dollar I make on them.

Much less painful than the headache of not having the necessary systems in place. 

There is a lot of psychology involved in avoiding bad tenants, which I am sure you already know. 

Don't focus on the pain, focus on the progress.When we fullfil our dreams we forget our biggest pain.Am I right ?

It also wasn't expensive (about $800 all-in) or a pain to establish. 

My wife is pregnant so she feels your pain.

Influences will try to drag you away to make lessor choices that will seem a lot more fun because they ARE, in the immediacy, what your doing is CHOOSING to make make the exchange, short term pain for long term gain.