F-35 is cheaper to acquire and significantly cheaper to maintain compared to all 4th generation fighters.IAF cannot afford the costly maintenance required of this plane in order to keep it flying more than 150 hours a year.
Read this:
In what surely must be a hard thing for Lockheed’s competitors to read, the Swiss Federal Council says: “The F-35A also has the lowest operating costs of all of the candidates evaluated. The total costs of the F-35A (i.e. procurement plus operating costs) amounts to approximately CHF 15.5 billion [$16.77 billion] over 30 years.”
F-35 Nabs $6.5B Swiss Deal; 'Lowest Operating Costs' - Breaking Defense
"Switzerland has no industrial or program stake in the program, and Swiss procurement, like the country, is largely neutral, so this reflects very well on the F 35’s overall technical appeal," aviation analyst Richard Aboulafia of Teal Group says.
breakingdefense.com
Rafale and F-15EX cost 2.5x more than F-35 to buy and operate.
PS: Don’t forget to put laughing emoji to show your frustration dealing with facts!