Is proof-of-stake profitable?

Could you please elaborate on the profitability of proof-of-stake? I'm interested in understanding how this consensus mechanism compares to other methods in terms of financial returns. Could you discuss the potential benefits and drawbacks of adopting proof-of-stake for blockchain networks? Additionally, are there any specific examples or case studies that demonstrate the profitability of proof-of-stake in real-world scenarios? I'm keen to learn more about this topic and how it impacts the overall performance and sustainability of cryptocurrency systems.