I didn’t realise you were trying to complain about the price and get the most expensive tickets!
I’m waiting to see what the difference gets you – I assume for XC you can go and stand where you want on whatever ticket you have, or get a seat in a slightly less good grandstand, but if you pay extra you might get a seat on the finish line, or be able to walk around the pits or something.
I dunno, 20 quid sounds OK to me to wonder around and soak up the Olympic atmosphere – if they thought they wouldn’t sell out they’d cost less. Also there will be special prices for kids and “Seniors” though no idea what that means.