Necessities like housing and fuel are great for sellers because they have low price elasticity of demand (people will keep paying for necessities)
and low substitutability (moving is difficult and expensive - or you may be locked into a lease or mortgage; switching from gasoline to hydrogen or electricity may require getting a new car, while public transit might not go where you need to go; etc.)
and barriers to new market entrants and/or to increased supply (beyond the time it takes to build new oil wells, refineries, or apartment buildings there may be regulatory barriers like environmental or zoning requirements).
Restricted supply and barriers to entry favor cartels and explicit or tacit price collusion.
Necessities can also provide steady tax revenue, since people are basically forced into paying the (usually regressive) tax.
The resulting high prices are, of course, terrible for people who actually need these necessities.
The market for addictive drugs (nicotine, etc.) has similar properties, though with some risk of legal or regulatory penalties.