You probably shouldn't be buying or selling Eldon's Circle of Law on eBay, but that's exactly what's happening on eBay. Do a quick search on eBay and you'll find dozens of entries selling millions of Loons, ranging from $10 to $50. Some even offer hundreds of millions of dollars for hundreds of millions of dollars. At present, it seems that the volume has reached hundreds.
Given that it is not possible for players to directly transfer Luen (the currency needed to level up) from one account to another, these grey market transactions take place like a classic MMO item exchange. Sellers set a time and place, summon buyers to enter their game as partners, and then drop the number of traded Luen on the ground, and after the buyer picks them up, the two sides are separated.
PC Gamer points out that while players can buy Loone like this, it's not a good idea.
On the one hand, players may be deceived, and on the other hand, the use of real money to buy or sell items violates The Eldon's Law Ring of Service. Players involved in these "illegal transactions" may run the risk of having FromSoftware remotely clear their Luan wallets, suspend their accounts or even be suspended.
In addition, the method used by these eBay sellers to generate Lune is not the right way. They may have exploited a co-op item copying vulnerability that has been discovered since Dark Souls 3.
If you're determined to boost your strength to 99, there's a smarter way than paying $15 randomly on eBay (if you're playing on PC, the cheat is already there, as long as you stay offline).