Is face to face fundraising really worth it?

Is face to face fundraising really worth it?: Is face to face fundraising really worth it?
Before I start I should make two confessions:

1) I am biased - my companies analyse data, help donor retention programs, acquisition, legacies and major donors and regular giving conversions by phone, mail and online, mostly in NZ and Australia. I don't 'do face to face'

2) I am not very good at face to face fundraising. The photo below is of me, as fundraising director at Mind (a mental health charity in the UK) giving it a go in London in the late 90s. I was not very good. The guy I am chatting to was French, and we couldn't get foreigners to sign up. But we had a good chat.