I 'm buying scouts from time to time (avg 1/season - or less).
I do that in the beginning, the first days, to take the advantage of gaining by participation during whole the season.
As Gert was saying, nordgen are better investment so I 'm looking for scouts only when I want to enforce my team and don't find the nordgen I want.
So, after the first morning of the season, after bought (or not) the nordgen I want, I go to scout list.
I 'm checking the list just after checking and marking the players of TM.
Usually going for positions
GK with 1-1
DR-DC, DL-DC,DC-DMC with aerial or DW
MC with F-K
AMR/MR, AML/ML or AML/AMC, AMR/AMC with shadow striker (never found in the right time)
ST with 1-1 or F-K
Those players must be 22-23 y.o. , with Q4 / Q9
If I spot one of these players, I 'm waiting till day 3 (maybe for a nordgen or nego player) and then I buy them.
Those players are rare in scout/list (as pcmac saying, usually the list is full of crap players)
that's why I 'm saying that list is uniqe, because those players are still there, till day 3 and some of them for more days.
I believe that if the list was shared, after day 1 the good players would disappeared (bought from others).
* if the scout list is shared, for how many managers ?
** it's simple to make a test. In the new season, spot a good scout and check if he 'll be in the list for the next day, day2.
If I 'll remember, I 'll do that.