I am well aware of what ISPs in the UK and Europe offer - I have recently moved to India from Finland (and before that France).
As nice as such a scenario would be, there are several things preventing this for the immediate future:
1. Most content accessed in India is on US-based servers. As such, this places stress on our international links - which are not cheap. At a 1:50 contention ratio, just to cover the cost of a 155Mbps pipe (just short of USD33000/month), we would need to charge at least USD34/Rs1,700, and even then, in effect, this means 7750 users would be sharing a 155Mbps line.
If you wanted that at 1:30 (4650 users) or 1:8 (1240 users), you'd be looking at USD56/Rs2,800 and USD210/Rs10,500 respectively - and thats assuming no-one wanted to make any profit or pay salaries to workers, and doesn't count other things like license fees to the TRAI or infrastructure.
2. There is not much hosting done in India itself. Unlike the US, UK, Netherlands, Germany, Japan and Korea where there are significant amounts of locally hosted data and large data centers.
3. Even with locally hosted data, there is the issue of a little organization called NIXI, who currently have a formula whereby ISPs are charged at Rs 50 per gigabyte incoming (although outgoing subtracts Rs 50 per gigabyte from the bill, so effectively the end price is still about Rs 35 per gigabyte).
If I had as few as 1,000 customers downloading say only 80GB of traffic per month each through NIXI, I would have to pay 80000*50 or 40 lakhs per month, minus say 20GB of upload traffic (so minus 10 lakhs), I still have to pay 30 lakhs. 30 lakhs NOT including the 16.5 lakhs per month for a separate 155Mbps line equals 46.5 lakhs per month - so for 1000 customers, thats Rs 4,650 by itself.
Bad
business, especially considering an 8Mbps connection has the potential to allow 2,000GB every month, and some people MIGHT abuse this.
4. In Europe, there are several other benefits available, mostly that the European equivalients of NIXI are far less expensive, as last time I checked, they don't get charged by the GB, and secondly buying international connectivity is cheaper due to distance. With the international cables here, you pay by the kilometer, so a link from Mumbai to Singapore works out at about USD400k per year.
Finland to Sweden, Denmark, Netherlands, Germany or UK, however, is significantly less than half the distance of a BOM-SIN route, therefore far less expensive to lease. All have very large data centers and internet exchanges, especially Amsterdam and London as well, which really helps.
My ISP will be offering an 8Mbps plan for an as-yet-unfinalized price, but it will be more than Rs2,500 - although we plan to allow 80GB of international downloads (and unlimited in-network), which we think is reasonable (I am looking for opinions on this - PM me).
Additionally, NIXI have told me that the price is being reduced, but by how much and when they have not mentioned.
Thanks mgcarley for your explanation.

I think taxes on ISPs should be removed so that ISPs can serve us with better plans.