Those who are in a haste to acquire an already established account raise questions. What exactly is their motive? Are they seeking benefits or trying to scam people by appearing trustworthy?
You know it's not easy to build a reputable account in the forum; it requires time, energy, and dedication. For someone to want to bypass this process, there's already a red flag. Similarly, when someone sells their established account, it raises suspicions. What went wrong after working hard to build it? Why sell it off?
Buying an account is not advisable because both parties usually have ulterior motives, which are unclear. It's best to take your time and work your way up the ladder. It's more profitable and safe.
The DT members of the forum are not foolish to not notice that an account has changed hands. One thing i have known about here in the forum is that there is nothing hidden under the sun. But sometime because of minor mistakes people tend to link accounts that are not theirs to their own. Irrespective of the proves that are being shown, sometimes the verdict is wrong, and a tag will be giving to such person. What am saying in essence here is that, when it comes to buying/selling account. Of course, the buyer and seller have different ways of reasoning and perhaps a sense of humor. One way or the other member will figure it out that the account owner has changed.
This depends on what you mean by reputable. A true owner of an account can still not have a good reputation in the forum. If he violates other forum rules, he still will receive equal punishment like another.