I think it would be nice for users who bought 96/24 versions to have access to the 16/44.1 versions for free. The thought is this, people who have 96/24 systems will buy the 96/24 versions. However, to play back as a CD, people with the hi-res version are doing their own sample rate conversion. The act of doing so using different software and methods means people are not listening to the exact same thing anymore when it comes to 16/44.1 playback. There could be no dither, different dithering methods applied, etc etc. Especially difficult because the sample rates are not multiples of each other, the end result could be quite different depending on how you do the SRC.
However, if purchasers are allowed access to the 16/44.1 versions as well, then with one purchase we all have at least one version as a baseline we are comparing against.