I've been in these debates !!! The biggest item is a margin verses a cash account. They say in a margin account locking them in that way will not work.. WELL imo ,if you DON'T buy on margin in a margin account to start with you own all stock in CASH , no difference. I don't know but to date mivt is not a marginal purchaseable stock. AND I had that conversation with many about requesting the stock certs. IMO again this is 2007 not 1927 what good what that do when you want to sell,, run down main street and sell em like newspapers. NO you have to send them back to your brokerage house have them add them to your account then what sel em,,LOL that could take weeks , not only that the security could have plumeted in that time.