Aluminum can be relatively expensive for several reasons:

1. Extraction and Processing: Aluminum extraction involves energy-intensive processes such as electrolysis, which requires significant electricity. Additionally, refining and processing aluminum into usable forms also require specialized equipment and resources.
2. Raw Material Costs: The primary raw material for aluminum production is bauxite, which must be mined and processed. Fluctuations in bauxite prices, as well as other raw materials and energy costs, can impact the overall cost of aluminum.
3. Supply and Demand: Like any commodity, the price of aluminum is influenced by supply and demand dynamics. If demand for aluminum exceeds supply, prices can increase. Conversely, oversupply can lead to lower prices.
4. Transportation and Distribution: Aluminum production often occurs in specific regions, and transportation costs can add to the overall price, especially if shipping long distances.
5. Recycling Costs: While aluminum is highly recyclable, the recycling process still requires energy and resources, contributing to the overall cost of the material.

These factors, among others, contribute to the overall expense of aluminum compared to other materials.