I treat weights the same as I do heights. Though they may be listed as a certain number, that doesn't actually mean they are that number. Some players are regularly shorter than their listed heights by an inch or sometimes more. Plus, given that the weights are all divisible by five is another sign that "Well... we're rounding a bit..."
Still, at least the players added enough weight to get the rounding! Lol. I do find the weights interesting, though, especially near the end of a career to see where a player started and how he ended up.