Not sure why someone wouldn't use services like free deposable email services instead. People also sell bulk email accounts (gmail, hotmail) created by proxies for cheap too.
I can see using separate emails from a privacy standpoint, but renting an email still seems like a security issue.
I think what the article mentions is the same thing but on a per-message basis. I.e. renting, rather than buying, is presumably cheaper. There are some prices in a screenshot in the article, but I have no idea how they compare to buying accounts outright.
Accounts Craigslist PVA 10 (4) $4.25 [§B.1] Gmail Accounts 6 (5) $0.07 Hotmail Accounts* 21 (12) $0.007 Facebook Accounts* 24 (10) $0.07
I doubt these prices are relevant today, apart from the continued price disparity between email providers.
Source:
https://krebsonsecurity.com/wp-content/uploads/2011/07/sec11...