Player values are determined as described here. Negative player values are ignored. Replacement levels are estimated for ABL 2019. Average batter & pitcher cards are estimated for ABL 2019. The keeps and draft picks are as of 2018-12-31, so no 2019 trades are included. The positions the keeps are rated for are not a factor, that is, if a team has three players who can play only third base, then all three of those players contribute to the total value.
It looks like there will be more parity in 2019 compared to this time last year.