This is the way FutuCorp makes a living. The give you credits for lots of things, let you use their robots and stadiums as well for free. So the have put a fee on the difference between the value you pay to get something and what you can get back for selling it.

The DNAs or whatever you are buying is still worth the buy value, but the sell value is just taxed very high. So if you are not happy with the sell value, keep it and use it instead.

Note that you can increase the scrap/sell prices a bit by boosting your financial director as well as you can boost it by being a club with expertise in sales.