Accounts with 100,000+ karma are $200 and up, apparently. Source: savingadvice dot com /articles/2023/05/31/1089629_sell-your-reddit-account.html

On playerup dot com /acconts/redditacconut/ I see one "rare account" that's 13 years old going for $120 and a 14 year old one for $150

Most are a few years old, just barely a few thousand karma, and $17-25.