I did spent money on this game - maybe a couple of hundred dollars so far, this season only I spent about 100 or so, but not only on players. I have a full scout team - except the two youngsters I got today. I only have 6 scouts left from last season and 4 of them are 5 stars close to 6 stars (by the end of the season) I din't advise you to quit the game - i'm telling you that without putting more money in the higher levels (6-7) you won't have much chance to win anything. Even tho' your players are good now they won't develop fast enough if you advance each season a level. By the time you reach level 7 you best players now ill maybe be 5 stars.
The idea to keep you in the best position in the game is to buy new players every season and keep up with the other teams, that's your best chance.
I can not have a better team than the league leader, he already has World Class team, with Super Star and Legend players. So even if I buy all new scouts I couldn't have world class team this season. Some smart players are staying in the same level 2 seasons to catch up the players development.
So with all that said - YOU figure out what you want to do.
I am just giving you some free experience thoughts about the game and other good managers.