Dieting for charity

I'm thinking of joining the Biggest Webcomic Loser charity initiative:

BIGGEST WEBCOMIC LOSER

In their words:
"Biggest Webcomic Loser is about webcomic creators getting together to raise money for UNICEF, the United Nations Children Fund.

Pledge donations for the extra pounds of your favorite cartoonists. You can pledge any amount per pound you choose. Those pledges add up so that every extra pound lost by a creator can be worth a lot of money to the Children of the World.
"

With this in mind, yesterday I found the scales from their hiding place under the bed, stuck them on lbs mode and stepped on. After a moment of dizziness (I hadn't stepped on scales since BEFORE xmas, and I underestimate my lardiness by sucking in cheeks and stomach and making thin faces everytime there's a mirror nearby), I found myself facing a problem. My weight in lbs last night was 178. Most of the other comic authors participating to the charity thing have starting weights ending with a 0 or 5. Should I lose 3 pounds before I even sign up to have a figure ending in 5, or have some extra cake for a figure ending in 0? Or even go berserk and stuff my face to put on 8 pounds before I start dieting?

OK, I know that the only reasonable option is to lose 3 pounds first, or just round up my weight WITHOUT having to actually put it on, but I abhor the thought of dieting. I tried to as a new year resolution and it lasted until Jan 2 afternoon. However, if I do it for charity, I should be motivated enough to stick to it, because I'm not doing it just for myself (a self that keeps suggesting that extra servings of pudding would be much more welcome as a sign of caring). It'd be really cool if people pledged and I managed to lose the 20-25 lbs that I'm going to set as target, and get all that money to Unicef. Now I just have to get off my ass and sign up.