Why mobile service providers in INDIA doesnt offers good data plans anymore(mainly prepaid users)

I became a hard core mobile fan by late end of my engineering career and love to browse internet in mobile device, really liked internet service given by my provides because no other provider was giving unlimited internet access and download for 24 hrs at a meagre 20rs, there was also a weekly plan where you get unlimited internet access and download for 75 rs, and a monthly plan for 375rs for the same, is that a good deal?? A big YES from me, its icing on a cake for a die-hard mobile internet user and i wonder if someone denies it
all above i have mentioned is only for airtel users in TN circle, i agree offers varies from state to state
i was using it to the fullest extent including for my project works
Things changed and i moved to hyderabad because i got a job there the moment i went there i stuck to the same provider(Airtel ) only for the internet services they offer and boy i was happy(i can check mails, chat with my friends, download songs, update my profile(orkut,youtube),check for updates for my mobile, download softwares for my mobile a lot more) to my surprise the services were even cheaper when compared to TN but there was a blessing in disguise from airtel here, only daily plans were available at 15rs/24hrs, no weekly plans and no monthly either, thats a real bummer
But that didnt hurt me a lot as i was busy with my work too and activated it only on my weekly offs things went on smooth and in came a message to me
"Dear customer the unlimited gprs plan is withdrawn and you can access rental free internet service at a "pathetic" 30ps/50kb"

why on earth you do that without giving any proper justification, the next moment i called their customer services and had a go at them and till now i didnt get any proper answer from them, torrid customer response

Days went past and there are no signs that they are going to reinstate that service and also there was no one word answer YES or NO from them

So what basically a customer do "move to another provider" i did that and choose RelianceGSM and enquired about their internet services it is next to horrible and they are not even close to what Airtel gave me but i am having an eye on their internet services because they are the only 3G ready provider once the 3G auctions roll out i will consider them

So still i am stranded by not getting the deal i wanted from any providers

Then came the revolutionary TATA DoCoMo try this too said my instincts also they charge per second "Great" other providers fall on their feet, what can they offer for customers like me well they too followed the herd in mobile internet services, the best available from them is 10ps/10kb

Coming back to airtel they came back with some decent offers like do a RC 28 and get 15mb free valid upto 7 days, RC 94 get 100mb valid upto 1 month but none close to what they are capable of "Why cant you give unlimited internet back" is that because of recession you couldn't afford, there can only be assumptions not confirmations

so still i hope in near future they will reinstate back