The two big tunnel brokers are primarily run by network transit companies for whom bandwidth is less an issue and who benefit from more IPv6 traffic and the exp

The two big tunnel brokers are primarily run by network transit companies for whom bandwidth is less an issue and who benefit from more IPv6 traffic and the experience that managing and debugging it provides. I suspect that tunneled traffic volumes will always be low enough not to significantly affect the bottom line, as anyone willing to maintain a manually configured tunnel will move to native IPv6 transit as soon as possible and higher volume production business needs will use native/load balancers/proxy servers instead of tunnels.