NOTE: If you're thinking about doing this, one note of caution. Google has strict naming references with their API, so be sure not to replace those variables with other names! It won't work.
Now, about getting tipped. If you've not read The Tipping Point by Malcolm Gladwell, it's an interesting read. I don't want to destroy Mr. Gladwell's words, but basically it speaks to the fact that, often, there seems to be a tipping point to decisions we make or in the actual events that unfold in our business and our lives.
After putting in my credit card information to process my purchase, there was an additional check box where I could pay $4.99 so that the company would maintain my registration information in the event that I lost it and needed to re-install and re-register the program. I thought about it for a few minutes… and checked the box. I remembered having to email another vendor when I had lost the registration key for their application and needed to reload it.
I bit! I'll most likely never write and ask them for the key, but I paid $4.99 for that warm fuzzy feeling. I'm not upset – it's actually a reasonable price to maintain my information. I'm surprised other vendors don't do this as well. This is the kind of scenario that Gladwell talks about in his book. I was already sold on the software, they simply asked me for a little more after I had already committed. Nice!