I am gonna break down the stats that infusions provide and how much these stats are worth in terms of gold at level 6,9 and 12. I am gonna use the items that are in game to evaluate how much the stats are worth.
Wp infusion: 40 wp, 20% attack speed and 7.5 shield and armor. 40 wp is 27% the wp of a sorrowblade so its worth 837 gold, 20% attack speed is how much a blazing salvo gives so 700 gold and 7.5 shield and armor is worth 125 gold (compared to tier 1 defensive items). So in total a level 6 wp infusion is worth 1662 gold.
Cp infusion: 40 cp, 15% cd reduction and 7.5 shield and armor. 40 cp is 27% the cp of a shatterglass so its worth 810 gold, 15% cd reduction is how much 1 and a half hour glass gives so its 375 gold and the 7.5 shield and armor are worth 125 gold. In total, a level 6 cp infusion is worth 1310 gold.
Wp infusion: 60 wp, 30% attack speed and 11.25 shield and amor. 60 wp is 40% of a sorrowblade so 1240 gold, 30% attack speed is 1 and a half balzing salvo 1050 gold 11.25 armor and shield are worth 187 gold. A level 9 wp infusion is then worth 2477 gold.
Cp infusion: 60 cp, 22.5% cd reduction and 11.25 shield and armor. 60 cp is 40% of a shatterglass so 1200 gold, 22.5% cd reduction is 1 cornograph and a quarter of a hourglass so 862 gold and 11.25 armor and shield are worth 187 gold. A level 9 cp infusion is then worth 2249 gold.
Wp infusion: 80 wp, 40% attack and 15 armor and shield. 80 wp is 53% of a sorrowblade so 1643 gold, 40% attack speed is 2 blazing salvo so 1400 gold and 15 armor and shield are worth 250 gold. A level 12 wp infusion is worth 3293 gold in total.
Cp infusion: 80 cp, 30% cd reduction and 15 armor and shield. 80 cp is 53% of a shatterglass so 1590 gold, 30% cd reduction is 1 and a half cornograph so 1200 gold and 15 armor and shield are worth 250 gold. A level 12 cp infusion is worth 3040 gold.
So there you go that’s why infusions are game changing, they’re so cheap (500 gold) but yet the stats they provide are worth so much gold even a level 6 infusion is a 3 to 1 investement. Unless you have the gold or you’re very close to getting a tier 3 item you should always be carrying infusions from level 8 and onwards, they provide you such a huge avdantage against a none infused oppenent they can really help you win mid game fights and build a lead.