Bet365 allows decent stakes even if you are limited. To win 100 or 150 is still okay because they have tons of mistakes each day with big odds.
Look at other books. There is no book where you can bet longterm without limits. Bwin/gamebookers will take you down to pennies without bankers.
Betting without Bet365 wouldn't be the same tbh, i take 75% of my bets there because they have a sick offer. Also you can have a lot of accounts because they don't have a strict procedure to register like other books have.
my experience is the same as outrider. limited pretty quickly but the seem to tolerate winning punters without taking any further action and in-play limits to win €900 per price are plenty big enough for me. ie I can stake 900 at 2, another 990 at 1.9 etc.
they pull some sneaky tricks like resettling bets at "correct odds" but it's a small price to play because you can't really do without them if you want to bet regularly on lower level tennis.
I prefer betvictor, paddypower and sbobet (especially asian handicap) as they tend to have the best odds almost each time i compare them. bet365 site is easy to use, though, and so much better than william hill.
I haven't been limited myself yet and won plenty of money at bet365. Also lost some, but in the black overall. There are plenty of positive reviews on bet365 and the sense I get is that they are a fair & reliable company. Having said that, I am not a consistently big winner and maybe things would be different if that were the case?
I only bet on the TAB. I am old fashioned and never bet online, only in person or on the machines. I only use cash too. Never cards because I have heard from many that they make it a nightmare for you to get your winnings.