Super-strict RAW, the Factotum's Sneak Attack doesn't stack with itself, so you can't use more than one IP per attack. Even if it does, you're right, you'll have a hard time getting enough IP to use a lot of it per attack.
But, of course, a combat-focused Factotum should have maxed Iaijutso Focus and EWP (Gnomish Quickrazor).
Originally Posted by Rubik
Whether "factota" is correct for the standard usage of the word or not is irrelevant. Just like "maneouvre" is incorrect when referring to anything in ToB.
I really, really
don't care. As far as I'm concerned, you're honestly just being rude.