By the time you get to 1985, a single gun was 15,000 and within five years of that it was up to 22,000. Fast forward to 2008 and the price was 37,000. Today, you don't get much change out of 50k.
Ok, the ejector question is a difficult one because there are a number of ways to cut and dice it. The Dickson records are not complete, guns missing and also duplicated numbers! Quite a few early guns were also converted to another maker/type of ejectors system before Dickson came out with their own one.
All the early round-actions were built as non-ejectors (from 1880), the earliest patent use number issued was No. 20 from 19th Sept. 1881. Nobody has seen a patent use number below this, so not sure if the numbers were even issued (the first triple barrelled Dickson carries the 'Patent No. 1' stamp but this was for three barrelled guns). The early guns were all non-ejectors and really streamlined, and the first set here were not even round-actions but back-action sidelocks using the cocking bar patent.
As I said above, Dickson fitted ejectors to round-actions from other makers and some prototypes of their own, the first noted on guns No. 4024 & 4025 from 1886. Dickson's own patent ejector system came into effect on gun No. 4074 in 1887 (the coil spring in the action) and was refined in revised 1899 patent with the claw 'kicker' and compressor, which opens the barrels, we recognise today.
The last patent use number issued and recorded in the records is 1910 and belongs to gun No. 7597 delivered on 12th Oct. 1956 for 320. There were some 28 round-actions built after this gun to present but Dicksons stopped issuing patent use numbers around this time.
Ok, after all of that some maths based on the info we have to hand with some speculation. The count of hammerless round-actions in the records is 1825 due to patent use numbers omitted or complete record entries missing (I think the number is actually closer to 2000). Of this number approximately 1600 were built as ejectors as intended.
Dickson never made a 16 bore side-pedal ejector or non-ejector with two barrels. They did however make five three barrelled side-pedal guns in 16 bore, but you need to dig really deep to buy one!