Posts 1 and 2 of this thread began with the assumption that most punters drop out after a few weeks. Over 40 years ago, I joined a syndicate where the professional writer undertook to bet if sufficient followers gave him the betting bank, and he took a small percentage for himself. (These days few would entertain the idea, but nevertheless I was among those who did.)

His methods were most educational. If each syndicate contributed 100 pounds, he began by having a betting bank of 50 pounds, with the remainder kept in reserve. Usually he bet on one horse, with a saver on a second to cover the original stake. If the bet won, he added half the winnings to the reserve, and put a third of the winnings on the next three bets. I think his unit was 10% of the bank.

He had a terrible trot to begin with, so when the betting bank was low, he took not the remainder, but only half of it, that is 25 pounds.

He then took a spell because of bad health, started again and with just three consecutive wins ( which meant increasinglh higher bets), he made every syndicate in profit, and retired because of ill health. He was a real gentleman.

It does point out that perseverance can pay off, and shows that doubling up to "get out of trouble" is a risky business.