bitcoin is difficult accounting wise:
* most accountants don't understand bitcoin
* UK specific: for EU customers, to GBP exchange rate set by HMRC (UK tax
authority) must be recorded for VAT purposes. The UK government doesn't seem
to have exchange rates for bitcoin.
(workaround is to do bitcoin sales in a separate "sole trader" business,
without VAT, but that is a bit sketchy)
Bitcoin has a lot of practicality issues, at least with UK based businesses.
This also applies to US businesses.
Minifree basically decided some time ago that using wire transfer is the best
overall method for now.