Small turbo engines are usually manufactured to a higher precision level with better materials than standard NA.

Bigger doesn't necessarily mean more expensive.

Not really, cheapo peasant car engine that uses low pressure turbo, like the ones used in Conti engines, they are manufactured in higher precision. It is also the reason why they are more susceptible to damaging easier, especially with wrongly specced oils. A low pressure turbo car usually will give you more power and lower FC deficit vs the same amount of gains doing just NA. Because of that manufacturers opt to go Turbo to get more power whilst keeping to emission requirements. But this comes at a cost of a more fragile engine. To compensate, they use better materials, but most of the people in this country abuse it and don't know how to mod it. Spoil it easily