Flat paint is used for minimizing imperfections, and almost always used on ceilings.

He said go with flat because it hides imperfections better and apartment walls don't get cleaned upon turns, they get painted and touch ups are easier with flat.

My goal is to gain experience on flipping imperfect properties for top profit.

Flat paint is often chosen because it is less expensive and hides imperfections better.

It merely expresses that the seller is 1) aware that their property is imperfect 2) not willing to nor interested in finagling or negotiating additional terms once in contract.

we do the the low visibility bedrooms especilly if they are not as nice wood , pine or a a lower quality oak where you are going to have imperfections.

Questions: do I bite the bullet and replace it all completely, or try to find imperfect matches to repair?  

I wanted to choose a dark cabinet color because a light color might make the cabinet look cheap and a darker color will cover up some of the imperfections better.I have a deep red accent wall (this is what the cabinets are lying against) in the white painted kitchen. dark grey-ish tiled floors, black countertop, SS appliances.Are there any interior decorators that can help a guy out?

I would go with the stain assuming its easier to clean but I look at things from a functional perspective, not so much aesthetic.She also said there are "imperfections" on the wall, puddied up holes from old curtain rods, but that's kind of irrelevant to me for a student rental. 

Seems like the first installation method that requires no adhesive and the claim that "planks are extremely flexible and self-level above the substrate to create a flat surface, even over imperfect subfloors, making for an exceptionally easy installation" could be an issue when the subfloor is not level.