I think you should add daily rewards as a way of earning cash. The values could be what I've suggested below.
Obviously, once the user doesn't go back on warmerise one day, then the next time they do then they'll get Day 1 reward.
You don't have to stick to the values provided, this is just another way users can make money. Especially since old accounts were removed. If these values seem like too much then you could lower them, I suggest by 5 so you get 100 cash on day 1 and 200 on day 2 etc.
What do you guys think?