Make It so there's no robbery cap on a person, but rather make it percentage. Let's say myth has 110m and walks around with It around freely, and the percentage I'd get is 10%. I'd get 11 millions from him, that would surely encourage people to store cash in alternate ways like safes which could also revive house robberies for example. The percentage could've been lower with more cash you have in hand, example 1-100k 33% 100-500k 20%, 500-1m 15% and any amout above 1m would be 10%