There is a chart that helps with this. If I was smarter I would have saved last years version.
Yes and no - for general baselines, it works fine. But each year is different. If the cutoff of "good" players ends at 30, then you need to have a lot of value to move to that draft position than if the cutoff was 44 players. Teams have different ideas of trade value. Does anyone think that we had any inside knowledge as to what the Rangers were going to do with the pick when we grabbed Stepan and Raanta from them? I doubt that played any part in it, but if you were to trade a pick away and still have a late 1st rounder, like we did in that draft, wouldn't you want to trade it to a team that was taking a player whom you either did not have high on your list, or that you were not going to take, even if available later?
The thing with this particular draft is that there are a number of teams with multiple picks between the 42 and 102 picks (AZ picks at 41 and 103):
Ottawa - 6 picks
Montreal - 5 picks
Los Angeles - 5 picks
Detroit - 4 picks
Carolina - 4 picks
Chicago - 4 picks
If the draft is as widely ranged in the 2nd round, I think you start to see these teams ensure that they get the top player on their board at the time. Hopefully, it coincides that there are multiple teams being talked to about a trade, and that their list does not assimilate your rankings. I think that it is probably a wish to see 41 and 134 net 52 and 53. But, if the player is that highly coveted, and a team like Detroit is offering 51 and 60 for the same price and same player, then you have to strongly consider upping the offer to ensure being able to move up.
So, yes, the charts help, but they don't include the variables of who is being targeted, what and how many teams are targeting that spot, and what ammunition each has to offer. Maybe you don't trade with a team not because of who they take at 41, but because they have another team in between 41 and the pick that you move to that is targeting the player you want. Ultimately, I think teams trade for two reasons: their board dictates to do so (meaning the player rank supersedes the pick number), and the player is falling into a different tier from what was earlier projected.
We have two excellent examples of both: Soderstrom is the first example - Chychrun is mostly the 2nd, with a small splash of the 1st reasoning mixed in. Even though we had Soderstrom ranked 3rd on our board, that doesn't necessarily mean that we are going to trade up to 3 to get him. It just means that at a certain point (let's say pick #8), our big board consists of the following order on our board:
#3
#8
#10
#11
#12
#13
#14
On our list, 1, 2, 4, 5, 6, 7, and 9 have been drafted. The #8 team selects the #8 ranked player on our board. At that point, you don't really care about the cost. The ability to grab your 3rd ranked player is now closer to reality, and the reward outweighs the risk. The range is a little closer to where the #14 pick and #9 pick have some gap to close. It is possible that #14 and #45 would have netted us just #9 alone, and we overpaid slightly. If another offer was there or the #3 ranked player would not have made it to our pick, that changes the value. Likewise, if the teams at 11, 12, and 13 were all stocked at defensemen in the pipeline, one can't rest because those teams may be looking just as hard at trading back, and you don't want to be the team who waits. How much of an ass-kick would it be to wait on teams and then have an offer come in right from under your nose to pluck that player from you?