All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His Slave and Messenger.
Sale by auction is permissible, and this is supported by the Hadeeth in which the Prophet, sallallaahu ‘alayhi wa sallam, offered an item for sale. A man said, "I will buy it for one dirham", and the Prophet, sallallaahu ‘alayhi wa sallam, said: "Who bids more than one dirham? Who bids more than one dirham?" When another man offered two dirhams, the Prophet, sallallaahu ‘alayhi wa sallam, sold him the item. [Ahmad, Abu Daawood and others]
The method mentioned in the question, however, is forbidden and it does not fall under the lawful auction sale, since the money is paid for subscription, not for obtaining information. Moreover, the paid money is not returned to the person who is not the highest bidder, and this is a sort of gambling because the sale involves inevitable loss for potential gain. Indeed, this is the essence of gambling. In the resolution of the Islamic Fiqh Academy, when listing the conditions of the permissibility of sale by auction, it is stated: "Requiring a deposit from those wishing to enter the auction sale is permissible. The deposit must be returned to all the bidders who did not win the auction and it must be deducted from the selling price for the highest bidder."
Moreover, it should be noted that sale on the internet is permissible on condition that it meets the sale's requirements and conditions. The sale's requirements include offer and acceptance between the seller and the buyer on the item to be sold for the price suggested. The conditions are: the item should be lawful, pure, of benefit and possessed by the seller who is able to deliver it to the buyer. The item should be known by seeing it, or fully describing it in a manner that shows its quantity, type and other features, which leave no room for uncertainty.
Allaah Knows best.