Speaking personally there are items that I would happily purchase but are unavailable.
I will be buying the new 8F in Early BR livery when it hits the shelves and assuming that Farish release a version in Late BR livery at some point in the future then I will purchase one of these also.
I will also purchase at least two 25/3s if/when an updated version is available.
Although I already have 4 Peaks (44, 45, 2x46) I will certainly purchase updated versions if/when released.
I still use DC but would like to try a sound fitted model if any one of the above is released with pre-fitted sound.
I have wagons on order from NGS, DJM & Revolution all of whom seem to be meeting latent demand.
My point is that part of the problem is unavailability of models that I would willingly purchase. I can't believe that I am the only modeller in this position.