As the entry fees are for the first 10,000 entrants (not registrations) I suspect it might change.
The email says you will be notified after 05/11 of when to pay, In my view the 60Euro ones will have X days to enter, those that dont enter will lose place and those slots will then be reallocated to the corresponding number of entries from the 90Euro slots (if 500 dont enter then the entries 10,001 to 10,500 will benefit) who will then have to enter by Y date and then it will move onto the 110 Euro entrants.