I've bought 3 scouts in my T11 club history

1. MC playmaker aged 23, one star short of WC - Season 4 OK, Season 5 Good, Season 6 OK, Season 7 Terrible, Season 8 SOLD!
2. DMC playmaker aged 22, one star short of WC - Season 7 Good, Season 8 Good
3. AML corner specialist aged 22, two stars short of WC - Season 7 Excellent, Season 8 Excellent

Would I advise you to buy a scout? Yes if it is a player position that you really need

Would it be a guaranteed hit? No, he could be a dud!

Should you buy? Just for the sake of buying one to try, yes.

You can spend 50 tokens at worst to get two 5 star players at the market who are a star short of being WC, but that itself is also a risk as they are not guaranteed to be good as well.

You can also spend 20-40 tokens to bid on a fast trainer in the market and then you would need more tokens after that to power train him. Again, results are not guaranteed