In response to people suggesting alternative ways of doing it - yeah, hindsight is 20/20. Used 301 permanent redirects on every page, and yet, still meltdown.

As for .com's having more credibility - I reckon they have a bit more, plus you'll lose some traffic when they mistake the .net/.com. There's a few sites I visit that are .net's, and when I'm not on my own computer with browser history, sometimes I accidentally go to the .com. We paid around $1500 for the .com in... 2004 maybe? This made a ton of sense, because with our margins/gross/net, it would have made a ton of sense for a competitor to buy the .com - they'd have been paid back on it if they could've got it to top 5 in google for us. (To all the people who might say that we could then sue them, the answer is that you're 100% technically right, but that's ugly and you don't want to waste time/lawyer fees in court except as a last resort). Anyway, even if it increased our conversions or preserved lost traffic by a small amount, it would have been a good business move... ignoring the loss of search rankings, which wasn't planned on and hurt.