For what its worth, I don"t think this is a sensible idea. I suppose its no different to writing a cheque for the amount but at least that would be paid into your bank account.
Personally, I have been having so much trouble with my account. I have been in contact via email with bluesq and have now given up on them sorting out my account as I had 3 of the exact same emails regarding my problem and it seems no-one is taking any notice.
Therefore, in the event I cash I would strongly not wish to have winnings paid into my apparently non-existent bluesq account, but if a decision had been made then heyho.
Can"t wait for Thursday on a plus note, wooop