Not $100,000, but if you browse through some forums/subreddits/... about online ads, you'll see a lot of people who want to improve their ads and have no idea if their campaign worked at all in the last months/years. They don't have tracking and don't know how to implement it. There are easily $1000s spent that way by lots of companies which adds up anyway.

And there are also those "I spent $1k in one day by accident with no return, help!" posts.