I may be wrong, but I believe scAdd, scPurchase, and scRemove are all custom implementation events and are not captured by default. So, I believe you may be talking about reporting on these events inside of Adobe Analytics. Could you clarify if you are looking for these parameters in Reporting and Analytics UI interface? Or are you asking why you are not seeing those events being captured in the beacon to Adobe Analytics?
DTM by itself cannot send any data into Adobe Analytics. DTM must be configured to use an Adobe Analytics tool. :) When you said that you are only using DTM to track your site, but no Adobe Analytics, did you mean that you have an Adobe Analytics tool configured in DTM, but you are not doing any custom tracking calls?