Its not bid2win but bid to lose your money. For most of the sms bids that you send to 6644 which is their number, you get replies like server busy, insufficient balance, unknown error etc from 6644. You get charged Rs. 10/- for these sms anyway.And if you contact them regarding these errors, they ask you to speak with your telecom operator when its not your operator but them sending these error messages in reply.
Their site updates rarely. The price list for buying credits shows one amount if you are not logged in and another amount after you login to buy credit. The winners list shows data from one month back. If you want to know winners of recent contests, you will have to wait till next month. They even had the paypal login form embedded in their page instead of redirecting to a secure page in paypal site initially. So beware of taking part in these contests.