You’re misreading the study. It says they asked 115 people for a low and high range of organizational spend on lobbying, and the sum of the estimates was 34-57 million.

So divide 57 by 115, and you get about 0.5 million euros on average for the high estimate.

(Some of the respondents may work for the same organization which complicates calculating the average. Hence why they’re reporting the sums instead, I guess.)