In Sweden you can sell your company either to used as a "shelf company", meaning the buyer will later resell it, or you can sell it with the promise that it will be dissolved/liquidated and not resold.
It seems much more popular to sell it to be dissolved since there are some risks involved with someone else using it in the future.
So I can understand if it is not very popular in Germany either to sell a company to be re-used.
What surprises me is that it seems to be a good sized market in Germany for someone to provide a service where they buy your company and later dissolve it, but the service doesn't exist (?)
The formal process in Germany seems simple enough. Just sign a sales contract at a public notary, the buyer replaces the CEO, and you're done.
Since this doesn't really seem to exist (?), I assume the potential liabilities for the buyer are so great that the service price would be much too high?