yessss
i definitely agree.
its so good, while leafleting, when a person who you've handed a leaflet to, comes back 5 minutes later asking for a few more to show their family friends. you know you've sparked a light in a once dark corner - and that light's contagious!
i remember when i first went leafleting. i went about just like you say, i didn't wait for anyone to invite me - i just bought a stack of leaflets from AA, and went for it! sure, it was a little tricky getting into the hang of things first alone, but now its a breeeeeze. not only does it help animals, but it can help you. my self-confidence soared after going for the first few times.
its crazy to think that the guy who started Mercy For Animals (one of the most prolific animal rights groups today) was just someone who found a littered leaflet on a cafeteria table. one piece of literature can be so so so powerful!