Its not guarenteed your odds will get matched while queueing so you could end up mugging it if it doesn't match. I don't leave them unattended incase I need to recalculate. I'd rather look for closer odds than queue but I am a newbie and don't know if it is better to queue. I can't settle till it's all matched so the quicker the better for me. I don't queue on horses either as it could be costly should the odds swing the wrong way.