When I was active in the Minecraft server scene, minecraftservers.org (and other sites) had very simple low-tech bidding like this. I presume it's still mostly

When I was active in the Minecraft server scene, minecraftservers.org (and other sites) had very simple low-tech bidding like this. I presume it's still mostly the same. They would hold weekly/monthly auctions for a "Sponsored Server" slot (your listing shows at the top of the page). Can't remember if it was weekly or monthly, but I recall prices being around $7-8k per slot. This was just implemented on the website as a super simple auction, you could see all bids and could only bid higher and the auction would expire at some set time. Then there was an even more low-tech layer around it all - people would rent their spots to smaller servers that couldn't afford to outright buy a slot. This was implemented as... Google Sheets with one cell for each hour time slot, with the sheets being linked to on various forums. You just sent a message to the Skype contact if you wanted to buy an hour or two, and for a couple hundred bucks you, too, could show off your server in your very own temporary minecraftservers.org sponsored slot.