I haven't yet used any red packs this season to heal injuries, and have amassed 187. During the season I have had 9 injuries (7 in matches and 2 in training). No player has been injured more than once, and the longest injury has been 6 days. So I can't see how the theory that its done to make you use red packs (and therefore tokens), holds up.

By the way, I am a token buyer.