Why is OpenSea so expensive?

Could you elaborate on why OpenSea's services are perceived as being so costly? Is it due to the high demand for non-fungible tokens (NFTs) on the platform, driving up transaction fees? Or is it the unique nature of the blockchain technology they utilize, requiring significant resources and maintenance? Additionally, does their reputation and status as a leading NFT marketplace contribute to the elevated cost? Clarifying these factors would help understand the rationale behind OpenSea's pricing model and why it is often considered expensive compared to other similar platforms.