if they do this then its just going to make it increasing difficult for people on less credits to get tickets as a gap will just form.
United need to put in measures such as requesting scan information at the away ground to see if the applicant actually turned up or a better weighted ballot by where only a percentage of each credits gets a ticket, (but in favour for people with more credits) for example 4-9 credits 75%, 1-3 credits 20%, 0 credits 5% . then if not all the tickets in upper credit bands get sold then they get filtered down.