Why dont you upload your ID, have your account verified, withdraw your coins and never come back? I think some people dont have the proper IDs to have them verified. There are some people who have multi-accounts on the site which they dont want to be caught red handed wash trading low volume coins.
I am pretty sure that's what a lot of people are doing, otherwise how to you explain the sudden drop in Bittrex market share since they started this verification scam. Remember the old adage, "only 4% of customers complain, 96% will simply go elsewhere"
I see it ending either with the Bittrex shareholders screaming blue murder, and forcing management to do the right thing by the clients to stop the exodus, or Bittrex quietly fades away as more honorable exchanges take over Bittrex clients. Remember the AML, KYC cover story for suspending withdrawals on unverified accounts is bogus on two fronts. Firstly, Bittrex don't do fiat. Secondly they could move their headquarters offshore if they wanted to do fiat and skip all the nonsense. Either way, the don't have a feasible excuse for suddenly seizing their customers funds and holding them ransom until they get private information (which has value) from them.