This is the thing. The interest they've made on my money won't be huge - by law, you're not allowed to hold funds like this in high interest accounts. At most, it might cover the cost of a coffee. The interest I've missed out on is dwarfed by the amount other retailers are scalping by.I would cancel my pre-order if every other retailer wasn't massively scalping.
I was annoyed this morning that I missed out on a stock drop of the card I'm in a queue for (Palit Gamerock 5090) at a different competitor, as it was sensibly priced by recent standards. That price - £2,230 - was still £80 more than my queue pre-order, which is far more than any interest I've lost out on so far.
Of course, if we get to the end of the month and I'm still in my current queue position or thereabouts, the smell of rat will be undeniable. But for now, holding on is still the best value for money option.