I have had two situations were a plumber told me I needed to rip out a shower to have plumbing work done.

Our project had numerous serious mistakes that required everything to be ripped out and started anew in addition to terrible communication throughout.

Cats will rip carpet and if they spray (piss)  on the carpets they will stink and cannot be cleaned.

Yes, tile can last forever, but in my opinion after 10-15 years the styles change enough that I don't mind ripping up 10 year old flooring to put in the latest trends so the unit stays fresh and updated.

The Yanceys' 3-day is a total rip-off at circa. $2,000.In the FB case, their focus is on you building an REI with minimal education.

Her nephew mentioned that they'll probably end up renting the place out but the house would need a LOT of work- paint, carpets, landscaping, new driveway, and whole kitchen and bathroom would probably need to be ripped out.

In contrast, large rips or indelible stains justify a deduction from the tenant's security deposit for repairing the carpet or drapes, or replacing them if that is reasonably necessary.One common method of calculating the deduction for replacement prorates the total cost of replacement so that the tenant pays only for the remaining useful life of the item that the tenant has damaged or destroyed.

We had to stipulate in the purchase agreement that he was to stop all work immediately because he was "remodeling" one of the units and ripped out a load bearing wall to open up the kitchen to the living room.

There's just too much opportunity for you to get ripped off.  

If your plan isn't to rip people off, then you won't have anything to worry about.