Anyone have experience with buying email lists?

I want to buy an email list and then send emails from another domain to opt into my actual domain's email newsletter, so I maintain my main domain's reputation and only email truly opted in contacts.

Anyone have experience doing this? Is this is a bad idea for any reason?

Why you need to buy an email list if you can extract them by yourself..yoou can use a free email extractor to get targeted emails in your niche clean your extracted emails from honeybots and spamtraps and you will have a fresh email list ready to use : you can use this free email extractor from ultrabyte it has full instructions to this in a proper way : ultrabyte.io/ecrawler-tool/