Some crashes have more profound after effects than others, and I suspect this is one of those.
Which crash are you talking about ?
The Chinook crash (BAH) had a huge effect on the North Sea. Following this accident, the Shell offshore workers refused to fly in the type, and so it became useless in Aberdeen. The airframes were eventually sold, and the type has never flown on the North Sea since.
In contrast, the S76A+ that crashed out of Norwich 10 years ago was seen as an exceptional accident, due to having had a lightning strike on the blade in the past. Engineering inspections were carried out and procedures changed, and the aircraft returned to service. S76's are still flying on the North Sea (including now 2 in Aberdeen covering from this latest incident).
Whoever decided to sell off all the Bristow 61's is probably wishing he had remembered the Old Man's practice of shoving surplus machines over into the corner just in case of a rainy day or a golden opportunity presenting itself.
Unfortunately that mentality has long gone. Each "business unit" has to "lease" the aircraft from the parent company. So if an aircraft is not on contract and earning money, it is seen as a huge drain on that unit. This also has the knock-on effect that that business units' manager is not achieving budget targets, and their personal bonuses are affected.