The purpose of house-hacking, as you're aware, is to benefit financially from another tenant/roommate subsidizing your cost of living. 

That will increase your cost quite a bit and might make the ROI untenable......?

I would recommend reading the book by J.Scott called "The book on estimating rehab cost" Also, network a lot and consume wholesaling-related content to give you a better picture of how it works. 

Generally will cost you about one month's rent, and some of that amount may get paid from your listing broker to the tenant's broker that brought the tenant resulting in a successful lease agreement (this benefits you because you are essentially offering financial compensation to other agents that represent who you need: tenants!)

This question becomes very important if your are financing any of the rehab costs.  4. 

Alvara handles it at a cost but still valid point as I do it myself like many others. 

You would need an exceptional grasp on what the 1031 will cost and the amounts you’re dealing with on the replacement and relinquished properties.- REI CPA in CA

Imagine the ARV being $15M and the Cost of repairs, $200K.

Is it worth fixing up (all properties should be fixed up before moving on to another to avoid repair costs later when you have more leverage) or is it worth selling in an imperfect state for less money (and harder with a tenant).

How much does RemoteLock cost?