That will depend on your current squad and which areas you need to improve and also which scouts are available to you. like younger 22 year old scouts that are 4/9 players are worth 50T where your 28 year old scouts that are 1/6 players aren't worth it.

To be honest in general with 50T I'd build a team of 5* players from the auction on my server its pretty easy to get a team with 50T to start with for bidding. but if your on one of those new servers where you only get 3* players from the auction, then the scout is a definate yes.