I think because of ADTV's promotion of Rs 200 for Value Prime Kids pack if taken with any HD TopUp (Magic / Royal / Max).
I searched our forum and got links to the promotion by ADTV. Check this link and scroll down (ignore the Request-Call-Back form)
Source: airtel Digital TV for Multiple TVs | Multiple DTH Connections
Bro, click on the link and scroll down (ignore the call back request form). Below, you will see two prices:
SD Multi-Price (varies on pack 99 / 150 / 240)
HD Multi-Price (varies on pack 200 / 200 / 270)
Here it is mentioned for Value Prime Kids HD Multi-Price, the cost is Rs 200, this means that your primary connection should have Value Prime Kids and one HD Pack (Magic/Royal/Max) and you will get it in your secondary connection for Rs 200.