Also, wouldn't this mean you have to pay interest on the ENTIRE amount of the loan, as opposed to tax on just the gains? So if you have $1000 that means at 2% interest (I assume that's yearly) you're paying $20/year, whereas if your stock went up 5% (= $50), that means you'd be paying (say) 25% of that, which is $12.50. So it should be only better if either have a high tax rate or your stocks /really/ increased in value (not just kept pace with inflation).

That requires 110k$ and you can't just take money with that rate, it's margin. So you should have more than 110k$ to take some of that money and replace them with margin.

What happens if your stock goes to zero in the meantime while you've borrowed against it?