Nothing to do with Tata Play wanting to provide DD HD channels or Airtel Digital TV not willing....if Airtel gets so much spare bandwidth as Tata Play got thru GSat24 they shall also add all the DD Network HD channels and many other channels available in India.
Talking about profit Tata Play has remained more costly operator in Pre NTO era despite the fact that being leading DTH operator with big subscriber base they would have got huge discounts in advance payment RIO deals they did with various broadcasters, i still remember they priced A La Carte channels so so high with some channels like CNBC TV18 Prime HD costing Rs. 100 so that people opted for DPO bouquets which too were costly...later too as far as discounts r concerned Airtel Digital TV provides more economical packs for customers be it account / region/ language specific packs or various offers on packs / new connections and other benefits part of bundled Airtel Black Plans, even i find Hardware + Software quality of Airtel Digital TV SD / HD / XStream Smart Android Box to be lot superior as compared to Tata Play.
Yes, Tata Play does not charge late recharge fee, Safe Custody charges and provides Channel Packs at Re. 1 as part of Jingalala Saturday Offers but still if you compare other discounts provided by Airtel Digital TV then they still come across at par or better than Tata Play in giving affordable services.
Lastly i have already explained multiple times why certain channels like Viacom18 HD channels r pending addition on Airtel Digital TV since a long time and same shall happen post LCN Realignment as before that it cannot be accommodated ....Please refer to those posts by searching with keywords as i would not repeat the same....other than that Airtel Digital TV has been adding various channels on regular basis