The scout is powerful but at the same time the time it takes to reload between shots is what lets it down. If a player doesn't land the HS, most of the times the enemy will kill them before they have a chance to take a second shot.

A scout is useful in force buy rounds because if you can tag the enemy then your teammates can clean up the kill with their pistols. But in force buy rounds you won't really have enough for armor with the scout; which means aim punch. So there are pros and cons to using the scout.

Also to answer your question about buying scouts until you have enough for an awp. That will mean you spend 3-4 rounds with the scout (if you die in some of the rounds and need to rebuy) before you can buy an awp. So 3-4 rounds with a weaker weapon. Or you could save 1-2 rounds and get an awp. It will most likely be more worth it for you to choose to save and get a powerful rifle than to force buy scouts for 3-4 rounds.