This is a bad bandage, but with good intentions, what we need is more sustainable money holes, not a reset of the money as that would just make people frustrated, any economy works in the following way:
The outgoing cash must be equal to the incoming cash, otherwise the money will simply become worthless to a point where as you say, its irrelevant and has no challenge.
Zarp currently has tons of income sources such as a money printing as a major.
We have temporary moneyholes such as titles, cars, gang and character upgrades, but no sustainable moneydrain, and people are usually only interested in few of these.
So resetting the money would simply keep players entertained until they would pass all those upgrades, not to mention that it would piss them off having to do it all over.
I made a different suggestion a while ago, to fix the same issue, you can check it out
here, if you feel like it!