How expensive is it to buy a star?

Could you elaborate on the feasibility and cost of purchasing a star? Is it a practical endeavor, and if so, what kind of financial resources would one need to possess in order to make such a purchase? Are there any legal or ethical considerations that one must take into account when considering buying a star? Additionally, how would the process of acquiring a star even work, and what are the potential challenges and obstacles that one might face along the way?