I suspect, that you have to have at least the level 1 quotes, or the $10 fee (waived for the small activity of $30 in commisions)
I do think it would be a nice gesture if they did something for IRA's , or at the very least, those with more than one account.
For a 10k or better IRA you are already paying 250 - 350 a year in LOST INTEREST. Pretty steep.
Let's face it, it does not cost IB that amount to maintain it, there are no postage costs, other than a once a year mailing. If someone has only a small inactive IRA then a fee may be warranted.
I have two accounts, and $20,000 that is earning NO INTEREST at IB. (Was a bigger issue at 6% than 3%, but that's a side point)
Other firms charge fees for inactivity, but none that I know of withhold interest on any amount.
IB is already being compensated, unless you're talking about an IRA with next to nothing in it, which is useless for trading. I will assume they don't have many of those.
How about no fees on IRA's >5000.
Sounds fair to me.