Even you have games worth of x amount money in steam calc, people here dont pay for retail prices for them. It means you could get some bitcoins but not even close to worth of 1000$. Also there is always possibility that some of your games has bans so they are not playable online.. we never know for sure. Ita your word against ours
Anyway good luck for selling but dont expect too mutch.. people here want everything as cheap as possible...