On William Hill, I was just about to place £600 draw no bet double on Chelsea and Celtic tomorrow and I hit place bet and it then came up William Hill cannot offer you this bet but we can offer you it at £500 you have 20 seconds to accept this bet. So I did but thought that was very strange, never encountered that before.
You've never encountered limits before? I would be really happy if I was able to place ~500£ bets at WH. I was limited to peanuts after about 10 bets or so.
I get that all the time at Will Hill. Was betting ~$1500 a pop for a few weeks (started with a $200 deposit), then after cashing out $17k total this month, they reject most of my bets greater than $500.
EDIT: on the bright side, they were prompt on all payouts.