I, personally, am obsessed with old house details and hate all the flips where people tear out original 1920s bathrooms and replace them with particle board vanities, builder grade fixtures, and cheap Home Depot tile. 

They have to eat it or inhale airborne particles (usually only occurs when sanding the paint and dust becomes airborne).Lead paint is not as common as people think and the risk is pretty low.

$100- $400, very loaded question, all depends on what you put into the house. particle board cabinets, Formica counter tops and vinyl floors or plywood cabinets with stained exotic wood doors,marble floors and granite counter tops?

Think about that in two years when you replace the particle wood piece of crap you put in there - lol.I would also suggest quality-built kitchen cabinets for rentals, for the same reason (not sure what yours are).As indestructible as possible is usually the best investment for long-hold rentals, IMO.I chuckled at the 2 am bandit sign comment, are they illegal in your area?

I recently hit the 3 year mark of being tobacco free.Immediately I didn't even question the possibility that the evaporation/aerosol inhalation of two of the most commonly encountered food, cosmetic, and hygiene chemicals, glycerin and propelyne glycol, would be harmful whatsoever.I heard the hype, I asked doctors. 

It has something to do with nano particles or something like that.)  

He uses an aerosol spray to get every nook and cranny.

The materials used in making these drive the quality and the cost;  - Particle board (and there are different grades of this) is the cheapest  - Plywood is better (again different grades)  - Solid Wood is best (and again different types)Water is the enemy of wood in general and cabinets specifically due to humidity and leaks so I prefer solid wood frame with plywood decks / shelves.

The problem is that 50% of the walls in the house are covered with particle board (like the stuff in the pic, I found that on google; not from the house) and painted over with glossy paint. 

They are generic looking particle boards with fake blond oak look, 1/2" thick.