I usually dont moove the funds from signature around a week,i see no problem to let the balance over a week or more then those,yobit never missed a payment and they have reputation and funds to cover their own campaign.I believe some people that use bitcoins daily as looks like you do must cashout daily the balance even 0,018btc not being too much but well you can invest them at others coins soo in the end may make difference,just an outside note wow what happened to doge at 37 satoshis amazing.
No actually I had all my earnings for ~ 1month saved there. I don't have a need to move them more often than that to save on tx fees. No matter how good an exchange is or it's reputation I know never to leave more than a trivial amount of funds there. History and all.