I've said this before, but I think it makes sense to ease up on the $4MM incremental limit on the way down because you can fire certain specialist scouts within the staff. However, on the way up, i mostly agree that it is fine the way it is -- the scouting department isn't one guy you hire, it's an entire staff. A staff, as a whole, develops over time. In fact, I think it would be neat to add another category like a specialist category that can make a 20 million dollar budget's staff even more accurate and give it the ability to see more players. Same idea here -- specialist budget can only go up 4MM a season to a certain maximum.
Having to wait three seasons to have your desired scouting is not ideal when you first takeover a team, but it is more realistic and once you have experience, you can appreciate the work it took to get there.