Two spot ETFs for the Sui blockchain have been launched, but they are experiencing very low trading volumes. According to NS3.AI, this highlights significant liquidity challenges for lower-ranked altcoins compared to top-tier assets like Solana and XRP. Despite having the same regulatory approval and infrastructure, these lower market cap assets are seeing a sharp decline in secondary market activity and investor demand. This trend indicates a concentrated market structure where only a few altcoin ETFs manage to achieve meaningful liquidity and institutional adoption, while others struggle to attract volume and sustain themselves.