Y doesn't anyone train for free so they could get more EXP and stuff

It's time consuming when you train for others and get no profit, so that's why people don't train for free. That doesn't mean there aren't people who do free training jobs though.

I mean more customers=more clan exp which= more coins by 10

because it not worth it, if I remember it takes about 3 battles to get 1 Million clans credit because the max amount of clan credits you can get per battle it in the 400k range (if you have a level 2.3k or higher), for you get each 10 coins, you will need to about 25-30 battle to get even 10 coins. So why do all that training (especially if the other person want a big amount of training) for a measly 10 coins for every 25-30 battles.

O OK now I see what you guys mean I got ya