Colorado is pretty dependent on tourism. 

Airbnb rental arbitrage can work, but it depends.

I find it's very personal, and dependent a lot on your goals, resources, risk tolerance, location, experience, etc.

Just depends on the mood of the appraiser.

How much depends on what you do for a living.

This stands true for any/every investment segment in existence; stocks, ETF's, business ventures.

Depends on your goals and the current market.

I've picked up several really good deals because a tenant operator ran the business into the ground to a point where the property owners just wanted or needed out. 

And that depends on how you view the costs. 

You could tell them to cancel the listing and you will find someone else to list it after a month not 4 months (the market take is subjective too, all dependent on what your house has compared to others, where it is located, the size of it, and so many other factors).