That is true, but he can always say that the majority of the 'fee' goes to purchasing the T's enclosure and accessories.Oh, and since he seems to be receptive to you, you may want to remind him that pet sales is prohibited on CL, so he might want to drop his adoption fee to sub-20 bucks.
Also, i think this guy is just uneducated, not stupid. The fact that he's taking advice to heart and admits that he has more to learn is a big step in the right direction. Be nice. :}