The main reason the Forest School is so expensive is because of the salaries paid to faculty and staff. The parents organizing the Caterpillar Foundation's school hope that in a parent-organized school parents can do much of the work themselves and thus lower personnel costs as much as possible. They think that the tuition for one month will come to about NT $ 5,000.
據瞭解，森小的學費之所以那麼高，很大一部分在老師、行政人員的人事費用；毛毛蟲的想法是，父母辦學就把爸爸媽媽當義工，儘量降低人事費用，目前他們估計一個月學費約需五千元。