And they achieve that by selling a limited run at a cheaper price than their competition, really!
The aspect of offering a discounted price in the beginning is used to gauge the amount of interest in a model, especially in an initial run, Auscision does offer only the full paid for one that allows a discount prior to arrival, those paying a deposit only are assured of the actual model number for a locomotive in the order.
It does allow for some adjustments to production numbers as far as the colour schemes & the actual loco numbers in that run. Also helpe with the sales when the model is in production or about to go into production to announce which numbers are sold out &/or running short therefore gaining extra orders for those as well. They along with all the importers reach a point in time where they cannot alter the order even in the paint schemes, so it makes good business sense in their eyes to do so.
Of interest though is there is often a call for importers to do reruns of models, many modellers have wanted TOR to rerun the 42, 47, & 49cl as well as the S class, they have said it is their intention to do so, they need to get all the 48/830cl out first as well as the remaining GM numbers, interestingly to me & others, I can only remember a couple of items of RS that Auscision has rerun, which includes the NSW NDFF, the 2nd run of which had a price increase of $60.00 per pack over the original run.