I highly doubt that there are many people out there who were readily buying songs on iTunes for $0.99 and now scoff at the idea with prices of $1.29. It is still a throw away amount.
Well, my typical thought process always went like this:
"Ooh, that's a good song. I should buy it. Well, wait... what about the other songs on this album? Maybe I'll like enough songs that it makes more sense to buy the entire album than the one song. OK, so I should probably buy the entire album. Well, wait.. before I buy the album on iTunes, I should see how much the CD costs. If the CD is only a dollar or two more, I'd rather get that instead. Let's check online... hmm, I wonder if this will go on sale anytime soon?"
... and in the end I don't buy anything from iTunes because I wait to see if the physical CD can be had for roughly the same price. You should see my iTunes wishlist. Full of albums that I want to buy, but am waiting to see if I can get a better deal first.
If the song is 99 cents, it's more of a no-brainer -- I'll waste a dollar quite readily -- but if it's more, I semi-subconsciously start to think "wait, is this a good idea?" Similarly if an album is $9.99 online then it's more likely to be "cheap enough to just buy online" compared to say a $14.99 CD, whereas if the online album pricing is say $12.99 then I'd rather spend the extra dollars for the CD.
Cheaper is always better of course but there's a low point where it's cheap enough to go ahead and buy impulsively and conversely there's a high point where I start to think about alternative purchase scenarios.