Encourages players to play as much as possible to get their money's worth.
"The recurring Legend Pass rewards repeat purchases, offering money off the next pass. This is an optional purchase that lasts around a month."
"In order to get any bonuses at all above the bare minimum, you are required to fill a bar over 60 days that brings you to a higher level, which amounts to having to pay once or twice monthly. It's still possible to play for free, but only occasionally, not regularly."