With regard to polycounts - they seem okay to me.
With regard to .dts - I'm not sure how useful that is to Blitz users. I think when "halo" says 'You would make a lot more money if you converted the models to .dts and sold them at GarageGames.com.' I think it is because Garage Gamess Torque engines use the .dts format. So, I think he is just advising you of how to sell it to that comunity as a separate community.
With regard to .dts - I'm not sure how useful that is to Blitz users. I think when "halo" says 'You would make a lot more money if you converted the models to .dts and sold them at GarageGames.com.' I think it is because Garage Gamess Torque engines use the .dts format. So, I think he is just advising you of how to sell it to that comunity as a separate community.