As trenches began to frequently appear and started to block the attackers, causing the assailants to pay a heavy price, everyone was eagerly awaiting a type of automatic weapon that could be used by individual soldiers. Whoever could produce such a weapon might once again transform the mode of warfare.
As long as the firepower was fierce enough, it could tear apart the enemy's trench defenses, allowing victory to be secured with fewer losses. Therefore, even if the price was high, everyone did not mind shelling out some extra Gold Coin.
Of course, in reality, the prevalence of machine guns was pitifully low, and most armies were not actually going to equip their soldiers with expensive weapons like the submachine gun on a large scale. Compared to submachine guns, militaries preferred to have more machine guns to boost their firepower.