It's an interesting comment you make psycho about the swap, particularly the hypo-swap - one of the most profound things I took from re-watching most of season 1 (as many as James Booker could find and upload to the Tube of Yous, anyway) was that the swap was generally, in its first few stagings, perceived as a joke. Rather than the straightforward choice between two boxes that it became, at first the players saw it as the banker taking the mickey, trying to goad them and play pointless mind games by offering a seventh decision in a game they'd been promised would need only six from them at most.
Irene, I think, laughed, and took up the swap because of the sheer novelty of it; herself and Noel eventually worked out a way that they'd go about the process itself, which entailed both walking over to the other contestant, Noel giving them Irene's box and Irene taking back the new box.
Nick, in the next show, interpreted it as a comic prop, set up to mirror the tragicomedy that his game had been ('What is it, forty?' 'No, £30' 'Oh, see, I'd have taken it at £40...'). It hadn't worked for Irene, so he might as well try his hand; didn't work for him either.
The swap was first offered to Oli, though, quite early on; with £5,000 and £15,000 left, Noel put down the phone laughing ('he-he-he...you're not a very nice man!') and said to Oli, 'we haven't had this happen before; do you know what the offer is? The offer is, you can swap the box if you wish!'. This was met with disbelief, a lot of muttering from various anonymous people and a generally...stunned...atmosphere. 'I would never swap!', said Oli, to much delight and rapturous applause. He didn't swap, and he won the £5,000, which was about right for a guy who came across incredibly badly throughout his game. Seriously, his only redeeming quality was that he was an exact replica of a twenty-something Jim Carrey.
Anyway, so the swap itself didn't carry any gravitas until some point in February of 2006, from my recollection, when for whatever reason, players began considering it as a serious option that may reap rewards. Interestingly, the first swap that really paid dividends, I'd say, was Valerie's in October 2006 (10p for £10,000); there were a few who swapped low blues for honorary blues, and Khanny got himself out of jail by giving away a fiver for £5,000, but we hadn't witnessed a really life-changing swap until Valerie, whose game I have no recollection of whatsoever.
The hypo swap wasn't treated with nearly as much ado in Candice's game - I've just watched the ending to re-familiarise myself, and it was more about the other box being her lucky number, and how she would've swapped if it was offered, and she pretty much invited the banker to offer it anyway; he did, she did, and I suppose if you take a post-modern view of Deal or No Deal, she ended up beating him in a roundabout kind of way.
There ends the lecture.