Ok,
my question is, how much coins you keep in wallet and how much on exchanges?
Is it like 50/50 or more like 90/10?
People should just keep as much on exchange as they feel like it's worth the risk. Exchanges get hacked all the time, it's your choice how much you want to risk.
I think it's like 80-20%, the 80-20 rule is very important. Keep 80% in safe place and 20% in a less safe, risky place.
You got the point there are people are just want their bitcoin to stay in exchange site that actually risky to do anytime there are trading site or exchange site can be hacked just like the other exchange site.. The traders reason that is why they are keeping their funds into exchange because the fee is really high so if they keep their funds in exchange site they can be less fee to pay..
unlike other people that they are transferring their funds into hardware wallet just to make their coins safe.. Right now we should put our coins into hardware or desktop wallet which is safe just like theymos said that its not safe to before segwit to keep our coins in exchange sites.