This happened when i bought a STK-5M and sold the XL engine and practically everything it came with, and ended up with a chassis worth only about 2m (sell price). The original mech costed 10 mil+, i sold pretty much everything that came with it (no reason to use a 315 when a 300 engine has the same slots for heatsinks), and i ended up losing 3mil+.
Its part of why people try out new mechs very rarely, we have to spend 10 mil or more for an assault when we just want the chassis.
And its pretty silly when we have to pay to downgrade from endo/FF/artemis/etc to get the build we want.
It really doesnt help that running a engine size that isnt in multiples of 25 makes no sense whatsoever, and most mechs come with engines that arent in multiples of 25, so vets just sell them immediately. And take a huge c-bill hit.
Edited by Jun Watarase, 03 May 2014 - 02:10 PM.