Thanks for all of your answers, I have understood them well.
Do not get me wrong, I've said I never bought an account, I asked with the desire to add experience in this forum
Tl;dr: If you're honest, there is absolutely no reason to buy a second account, let alone more.
Nothing is ever 100%. Sure, there could be some outstanding posters who bought accounts, but I don't know who they are. That's rare. Most common is the use of a bought account by some lazy third world scunt who only wants to shitpost or scam. Can't tell who's who ahead of time, so I neg 'em all. I have removed negs in the past when someone turned out to be OK--my ratings don't mean much anyway as I'm not on DT.
The amount of outstanding posters that are actually bought accounts is so low that it shouldn't even be considered if a rule change (which is badly needed) regarding account sales were to be considered.