100-400 sparks over 10 days (one win per day bringing in 1X-4X) is a competitive supplemental income stream. You also can fight more than one battle per day (with massage/drugs to restore energy). So you can easily double and potentially even triple it.
I don't recall exactly when we made this change, and I don't have a strong opinion about it one way or the other.
The 2.2.2 version has some known issues so you will have a better experience if you update to the dev version, which you can find here:
You must be registered to see the links
You only need a "code" package (~40 MB), not the media.