Um maybe you haven't been on this site in the past few months but TDS has gotten extremely popular whereas HTL hasnt even been relevant lately. 2 eps in like 4 years.
This site is not the world. Thie number of people who look at this site barely means anything as far as a band's fan base. Why do you think TDS does extremely rare headliners? If TDS were bigger, they would headline. Come on, you have got to know this site is not at all an indication of how well a band is doing.
Also, 2 EPs and one album in 3 years isn't terrible.