The crate contents are pretty meh and seem to be getting worse over time. The first set of ~10 I turned in were worth about 200m/each while the set I turned in yesterday were more like 100m each.
I’ve opened around 45 crates in total, 15 per empire (Gallente, Caldari, Minmatar). Compared to selling the cores it was a loss. But heavily depends on luck. The range of reward tokens alone was between 550 and 2200. Most of the time you’ll get the low-level boosters and low-value Skins.
On average the crates might had a value of around 125 M.
But I also did it to get the Skins from the personal reward tracks. Hard to put a value onto these.