Gwern has a point that it's pretty trivial to run this robustness check yourself if you're worried. I ran it. Changing the $1 to $100 reduces the coefficient of EA from about 1.8 to 1.0 (1.3 sigma), and moving to $1000 reduces it from 1.0 to 0.5 (about two sigma). The coefficient remains highly significant in all cases, and in fact becomes more significant with the higher constant in the log.