I just want to add a signature, so I can get into one of these signature campaigns and price my posts. I don't want to wait for half a year, posting for free.
Then you do not deserve the rank and reputation earned on that account both positive or negative. The ranks are not for sale, the reputation of an account earn are not for sale too. It's something you achieve.
Still there are people who buy and sell accounts but that's an under-table business. In the deal you are always at risk of getting exposed and once exposed you will find yourself in a very bad shape unless in the mean time you have done something extra ordinary to contribute in the community. Not everyone have this mindset. Most of the buyers buy it just to earn from signature, they do not understand the value of the community so they continue spamming to get paid.