No idea when that bath and washer drain was put in, so I don't know if there was a possibility of grandfathering it or not.

More importantly, my wife has a washer and dryer.

Here's what I generally pay (remember, this is my area, my contractors, etc, so it may not be apples-to-apples in your area):Water Heater plus Expansion Tank: $125 (done by plumber)Gas Range: $25 (done by plumber)Fridge Water Line: $15-25 (done by handyman)Dishwasher: $75 (done by plumber)Garbage Disposal: $50 (done by plumber)Built-In Microwave: $40 (done by handyman)Washer/Dryer, plus Venting: $25 (done by handyman)Oftentimes, my project manager will do most of these things, so it's actually free, but if I'm paying my contractors, this is about what I expect.

They may ask "why can't you buy one of those new front loading washer and dryers for us?" 

If contents coverage was purchased it would only cover washer / dryer and a food freezer only.

Seller to maintain the property but selling "as is" some conflict there` as worded, if an outdoor faucet blows a washer and water starts running out, the seller doesn't fix it?

I’ve seen bathrooms that actually suffered from too much space—the excess created an awkward, unfilled area that would have been better used by bringing the wall in and opening up more space in the cramped and awkward washer/dryer space that backed the bathroom.

When I asked her what was her purchase limit.

Washer/dryer?

Kudos to you for being nice, but this was her CHOICE.