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For what i saw, if your players are 110 in a skill and the max point you can get is 115, the gear from sport shop can only bring you to 115. So a tiers 1 gear (+5) will be enough. A tiers 2 gear (+10) will cause a waste of 5 points. Gear from sport shop only help in early season if you just promote into a new level of championship. It will give you enough point to reach the new max point of your level. But as the season will go, as it efficiency will dimunish (because you will earn point through training and games to build your players properly).