User blog comment:TheTobarMethod/ADC Mid....It can work!/@comment-83.196.51.251-20130129154509

you CAN adc mid, but at equal skill  the ap carry will rape the ADC early game

appart from  sivir  who counters most ap mids

but it's still not  a good idea in competitive play :

ADC damages goes up mostly with items

AP carry damages goes up by leveling up and maxing skills + items

so it's more interesting to have  an AP  outleveling others than an AD