Yes, of course the parent did not specify what they thought as “cheap”, I am only pointing out that it is apparently not as cheap as a couple of airplane tickets.
In other words, their point was that all you need is a desire to fly an airplane into a building, but my point is that you need that plus XXX kilodollars (spread over time or not). Reportedly, one of the 9/11 guys was wired $100k in one go[0]—these amounts could be noticed, but dealing with very profitable accounts one might just be too greedy for that.
[0] https://en.m.wikipedia.org/wiki/Responsibility_for_the_Septe...