I don't think this was an attempt at a renegotiation as it was ignorance and stubbornness.

I see a lot of scenarios with stubborn sellers who list and stay on market for months and months at a time and never sell because they think their house is worth $100k over the actual sales comps in their neighborhood.However, with all that being said, there are deals to be had.

You mean you didn't even have to crawl around under the trailer trying to track down a mysterious odor, or shovel cat crap out of a closet, or play "guess that stain" with the living room carpet?

For instance, there may be no holes in the walls and no stains in the carpets, but you may feel like the cabinets could be better.

Despite what the lease said, they painted the condo (poorly, and a horrible color), installed a backsplash (again poorly, which had to be ripped out), stained the kitchen cabinets, spray painted the patio, destroyed carpets with filth, and caused $7K in overall repairs.

When its a proforma which appears to be what you are looking at the price is usually flexible unless its in a hot area or the seller is stubborn with the asking price and has no actuals.On the other hand you will see seller provide actuals and are firm with the asking price or have some flexibility. 

It was constantly getting etched and stained.

Also looking around ceilings, windows, and lights to see signs of water damage (brownish stains). 

Evictions can be nasty and stain the relationship so only do one if you have to.

I prefer sealed and/or stained concrete.