They give u attack stats boost I was once darts stats of 400 400 and number two in a ok clan because of my 200 allies each costing 100k they really help if u know how to buy
It's 0.02 I'll use a lv3 SOS as an example fully loaded give you 3,248,000 times this by 0.02 is 64,960 bonus to allies (green numbers) if you bought say 1,000,000 worth of spy attack stats you would times this by 0.02 and add to your bta to give your spy attack strength. So your actual spy attack would be 84,960. Short answer: they make u strong
Tks For the advice J3acon and the_but_kicker. @Frontosis I know it adds up to strength but I wanna know the exact value
Also forgot to mention that allie stats don't weaken like build stats, so with the above figures if you just had 1 spy left it's strength would be slightly above 20k