Indeed, same reason I don't usually go to Indian restaurants, I can just make the same thing at home with much fewer costs. The only ones I'd go to are specialized or well known ones, such as some South Indian places I've been to recently.

What's even more interesting is no one actually makes butter or tikka chicken at home, or has a tandoor to do so, but Indians also don't eat it outside generally, instead it's mainly foreigners who like those dishes.

I feel like similar to the chinese, indian home cooking and indian restaurant cooking are very different; I can try my hand at a lot of restaurant style recipes at home but it's not what I usually cook or what I grew up eating at home.

I'm assuming by tikka chicken you mean "chicken tikka masala"? Because chicken tikka is something my family made all the time growing up. I still make it at home often. That's mostly been with a charcoal grill and not a traditional tandoor, but like you said, most people don't have tandoors at home. That's restaurant food.