I'm saying the paradigm of storing bitcoins at private keys you don't exclusively control (so they can be stolen, with zero replacement insurance) itself is nonsensical shit, especially on a site called LOCAL, not Remote... Bitcoins.com.
Yes but aren't most sites are using that offchain system ? like mtgox,coinbase,inputs and many others.
Also you don't need to store your all bitcoins there, just the bitcoins you want to sell and if you are buying bitcoins you should withdraw them immediately after getting from seller.
PS: sorry for errors i'm on cell now.