Strategic advisory work. As an industry analyst, I would get paid up to about $18K per day from large clients. (Really a day plus travel plus prep plus some follow-up. And sometimes two of us would do the engagement.) But, still, $5K-$10K per day although we didn't get that level of engagement all that frequently. $10K-$20K is also the rough going rate for speaking at sales meetings, etc.

$2K or so per day was more routine for reports on a variety of topics (competitive analysis, strategic options, etc.) Expert legal work is probably in the $400-$500/hour range.