I have a good number of CD/LP duplication.
I also duplicate favourite LPs of which I have original pressings, when good reissues appear e.g. 'Astral Weeks', Marc Levin's 'Songs Dances and Prayers' and soon Jeanne Lee's 'Conspiracy'
I have three different LP versions of 'Unity' and a CD. Same with 'Black Fire'. This is just upgrading and not selling on.
Which goes some way to explain why I have someone coming to quote for building more shelving...