~I don't think the prizes have been updated for a really long time, and I would be surprised if it was ever a good deal to do so (instead of just taking the BTC conversion and buying it yourself).
We do periodically adjust to the current market value but you are correct that it has been overlooked for a long time. It's pretty difficult to do when BTC is volatile. If we adjusted today and there was 30% correction tomorrow then we'd be making a big loss buying iPhones.