Is Basic Attention Token worth buying?

Could you elaborate on the potential merits and drawbacks of investing in Basic Attention Token? As a cryptocurrency and finance expert, what factors would you consider before making such a purchase? Does the token's underlying technology and use cases seem promising? How does it compare to other similar projects in the market? Also, how would you assess the token's liquidity and market capitalization? Finally, are there any potential risks or regulatory issues that investors should be aware of?