I work for AT&T and can promise you that not a single penny of your $30 data plan goes to Apple. The subsidy paid to Apple is from the upfront hardware sale. For example, if you buy an iPhone for $199, the real cost to AT&T is actually $575. If you buy an Iphone for $299, the real cost to AT&T is $675. The $375 difference is the 'subsidy' that is paid to Apple for EVERY iphone sold in the U.S. This is part of why AT&T's profits fell. It's a GREAT deal for Apple, though!
Most phones at AT&T are subsidized by between $50 and $150 dollars. The Blackberry Bold's subsidy is on the high end at $150. No other phone comes close to the iPhone's $375 subsidy.
Right....and my point is that these high subsidies come from somehwere! They don't magically get paid. $375 is priced into the plans whether we like it or not ($375 divided by 24 months = $15 per month). So don't blame AT&T for these high monthly charges.