Affecting profitability
The silly joke of the studio conglomerates' lawsuits is that no movie was unprofitable because it was pirated...and no TV series was canceled because of low TV ratiings due to after-the-fact pirating.
In fact, as the "Where's the 'any' key" executives and attorneys at TV networks & movie studios spend millions on legal fees, they could've used that money to hire great technical teams to build any-device, time-shifting, place-shifting video services. (See Aereo, as an example of Barry Diller doing just that.)
And the Nielson rating company monopoly in US, was being lazy in not adding viewership statistics from DVRs and YouTube, so some shows that were actually popular were canceled because the ratings measurement was incorrect.
James Cameron proudly proclaimed that as "Avatar" zoomed past $1.5 BILLION in revenue, it was the most pirated movie.
The intrinsic friction here is that the movie bosses want to artificially reduce day-one demand, because they think they'll be able to milk revenue through all the various distribution "windows."
o Theater
o iTunes/Amazon
o Netflix (expires if movie wins an Oscar or sold to HBO for a 12-month window)
o DVD
o HBO or other movie channel
o Basic cable channel
o Free TV broadcast (after 15 years)
o Etc...
In fact, it may be likely that many people with families, busy schedules, less disposable income, traffic/parking annoyance, ugly local theater, whatever reason...would rather watch the movie at home on their internet set-top box or tablet...
Btw, note also, a movie ticket for the Wizard of Oz in 1939 was 23¢.