Never had this happen.
You are recommending people trade via their IRA's?
You should know me by now. I don't make ANY financial recommendations on DDF.
I can tell you that I have traded in my IRAs, it really takes away the tax tail from buy and sell considerations. I have a taxable account and the considerations mentioned above are taken into account with every trade, unlike trades in tax-qualified (mostly ROTH IRA) accounts.
For example: let's take a speculative play like this one. Say someone put in $1,000 into it in the pre-market and sold later in the day for a total gain of $3,000. Those are short-term capital gains which are taxed at the same rates as ordinary income. And for someone close to a threshold between qualifying for Child Tax Credits and not qualifying, that could be highly detrimental. The actual cost can end up being more than the short-term gain.