I bought a ticket for Weller at the Brighton Centre a couple of weeks ago. Clicked on the link from Brighton Centre website which of course took me to Ticketmaster. Looked at all the fees involved and thought sod that. A return on the 700 bus was less than half the fees Ticketmaster were going...
Not credit card related, but Seagull Travel charge an 'Online Booking Fee' per transaction.
Not so long ago it was £1.50 per transaction. This season it is £2 and we've been told that next season it will be £3.
I but a season ticket for home travel on ST - so that attracts just the one...