After watching a 'reaction video' to the older roughly 50 minute long gameplay demo, a good scene came to mind again. Of course any or all of this could be long outdated by the time of release but in the demo itself we see a few pointers:
1) how much certain augmentations cost based on values on the Ripperdoc screen
2) that the Spider Bot, an experimental high-tech piece of military equipment is apparently worth some value about 50.000 €$
It should be vital to note that the gameplay demo is still relatively at the start of the game in comparison to the overall plot as you try to get some reputation and money through jobs before you move onto the "big chip" and among the options is to keep the money on the chip for a more hostile entry in the particular quest. So, assuming that if you decide to try to keep it and could've used the money it seems you can already have some value around several tens of thousands €$ at the beginning of the game.
Sounds like much and likely is much. While these values might be outdated or not, I think that information is something to work with in determining what rough €$ values and rewards we might see or have established. So a character eventually having 100.000 plus credits - or several hundreds of thousands if not a million - based on old information would be something one can expect.
If those values remain consistent for the end product, V could end up as millionaire, especially if you don't have to expect constant fixed costs and usually rather gain money than you spend, but that's speculation at this point.