Managing your team’s economy is a significant part of winning rounds. Before you buy any weapons or utility, look at all of your teammate’s available resources. Just because you have enough money to buy a full loadout, doesn’t mean you should.
When a team has 5 players with full loadouts, it’s a formidable squad. When the team is only able to buy 2 rifles, it’s at a significantly lower power level and is far less likely to succeed. If you have enough money to buy weapons, but your team doesn’t, you should save that money for the next round.