Interesting - he gave a talk on this at Microconf Europe which was this last weekend, and a very good conference with lots of cool and interesting people. There was (I thought) something of a feeling in the room of "hrm, maybe this is a bit over the line?" although everyone was appreciative of the fact that it was a much stronger validation of the idea than just handing over an email address. Watching Adii talk, I certainly got the impression he was not 100% happy with the approach himself, and wrestled with it some.
OTOH, I can understand the risk avversion: if they've given you a CC number (they were not, however, charged), they're a Real Customer and your product is far more likely to have legs than just getting an email address, which is in turn better than not even having a pre-launch page and just hoping people want whatever it is you've slaved away building for months. Spending a lot of money to build something only to find no one wants it, or wants a fairly different version sucks big time!
OTOH, I can understand the risk avversion: if they've given you a CC number (they were not, however, charged), they're a Real Customer and your product is far more likely to have legs than just getting an email address, which is in turn better than not even having a pre-launch page and just hoping people want whatever it is you've slaved away building for months. Spending a lot of money to build something only to find no one wants it, or wants a fairly different version sucks big time!