Kohl's is king of overpricing items to then offer massive sales through "Kohl's points", coupons, etc. Their retail prices are B.S. I don't know anyone that pays retail at Kohl's - people shop there to brag about how much of a 'deal' they're getting, which isn't much of a deal at all.
Kohl's also reprices many of their products on a daily basis. I used to be a repricer. I would walk through every night for hours changing the price labels on all the stands. That's why they have updated so many of their price labels to be electronic.
Generally yes, but you can stack discounts often if you play the game. Things like shoes on clearance can end up at 15% of their original price- I've gotten a wide variety of stuff like that.
Now my wife on the other hand, will usually end up just with Kohls Cash and maybe 20% off, so it ends up fairly meh in the wash.