Originally posted by biz-engineer The minimum loss with camera gear is to use the gear until it stops working, otherwise it's always more money lost. the more you switch the more money spent. Switching to another brand of same format without a strong performance improvement on images is the least cost effective operation (essentially fulfilling desire, on big waste of money). Switching to another system with significant better performance (i.e Sony A9 or moving from FF to MF) is more cost effective but still very expensive. The advice for myself is buy a full system and keep it for 10 years or until it's dead, when it's dead, evaluate what's available.
Ofcourse, but his gear isn't brandnew today. So some of it may be bought in 2016 when K-1 came or even older. People have to except that camera gear depreciates over time as a fact of life. So his loss may be smaller today then he thinks, because his gear lost value over the past years already.
I wrote an article about some years ago (in Dutch).
http://www.pentaxforum.nl/smf/index.php?topic=20288.100
If you realise that a camera and lenses loose value over time (as cars and computers and furniture) you know what costs are there to take as "normal costs". A 2000 euro K-1 that has a lifetime of 6 years (maybe more, but who knows) will depreciates with 25 euro every month. If you loose more then that due to shorter use, those extra euro's are your extra losses and not the 25 euro to start with.