Use the following trick to make money as well as develop players. First, put a player on the Transfer List that CPU's teams are interested in. When they make an offer, reduce it to £0, then put a buy back clause of £1,000. Scroll down and enter a clause "After League Appearance - 1" then increase that to the amount that they offered. Once the player makes his debut for the team, you will get the money and can then buy him back for £1,000. Note: This is especially useful for youth players, as it allows you to earn money from them while being able to get them when they develop for almost nothing and also saves the wages.