I think the issues of whether you will or won't do it for charity is a matter of attitude and how one approaches it. I personally don't have a problem with asking folk for money, people will either support you or they won't, I won't make a judgement on them, I don't care. I'll ask them any way. In my experience some of my closest friends did not support my charity on this occasion, yet folk I barley know and in one instance this time I had never heard of were very generous.
My wife and I raised over £1200 for DEBRA, money which will help the various causes that DEBRA deal with.
Next year, if don't get a ballot place I will do a charity place, even if I have to sponsor myself for the whole amount.