I usually spend about £50 a week which i can comfortably afford and my attitude is – £1 stake, hope for a decent hit/bonus and if i can grind it upto 10x my deposit ill withdraw, if not ill just wait til the following week.
Id say roughly 7/10 times i seem to manage a withdrawal (could be down to luck), but it works for me and you know the saying… If its not broke…