it's not 50 bitcoins, it was more like 100 pounds at that time.
If someone had written to the admin and offered to donate 2 million pounds, he wouldn't have refused.
Donators and VIP members donated their bitcoins in the past, not in Euro, pound or US dollar. They possibly calculated their bitcoin donation in fiat value (or they did not), but they donated bitcoins, not other coins or fiat currencies.