yes, I hear you
but on page 409 he writes
"the spread between the low and the high limit given by the casino manager violated the basic concept of professional gambling limits which, of course, is not to allow more than six or seven doublings up."
really - I never head of that basic concept
I hadn't either, but I can't say for sure that wasn't how it generally worked at the time. If not as a rule, then perhaps in practice?