Internet from Direct Broadcast Serivce Internet is very much costly in India , like 3-5 USD  per GB @ 3G networks and even in broadband 100 USD for a unlimited banwith for 2 MBps but here DTH (Direct-To-Home broadcast service ) is very common and cheap , like 4$ for a month with most of the channels . I think to buffer a 480p video we would need 200 KB/s (2MBps ) plan in internet but how DTH providers give that much bandwidth for TV service for such a low price .

My main point here is :


Can we use DTH service for Internet using (direct from satellite like the DTH works).
Can we get same bandwidth for using internet just at same price just in case of DTH .
No you can't, because the internet depends on you having a method of sending data. For example, the question you've asked here came here somehow, so it's obvious you need to be able to send data. 

Now, TV is broadcasting, it's a one-way transmission, without a back channel.

There are satellite internet access services, but they are far more costly than what you've described, and much much slower. 

Also, some countries had things that used a telephone line as uplink and a sattelite downlink, but they suffered from cost, the asymmetry between the fast satellite downlink and the slow telephone uplink, and the poor latency.