I've cashed out all I had yesterday for $10k AUD each. I think the "free money" is a red herring and there's more chance of both chains combined being valued less than BTC today alone, than there being two highly valued working chains post-fork.
Im pretty confident that the original bitcoin core chain will be the one voted by the miners as the future high valued fork and not the new altcoins. But I think you have taken a good decision in cashing out. I will not be astonished to see if there is a price crash after the fork or maybe before the fork as well the fluctuations will be seen.
I'll be in cash and on sidelines assessing the market, then maybe put some in alts till the dust has settled.
Keep an eye on the price after the fork. I am sure there will be people selling and thus a good time to buy some bitcoin and maybe some altcoins as well.