If a potential 700 quid was in front of you, would you be a D head to it or would you be nice and create an atmosphere to which that 700 quid would want to comeback to?
I know what I would do, sure... but it also depends on the person, at the end of the day.
You will get some who are just 'Ped boys wanting to hoon about and will not listen to any sense, before one day (likely sooner than later) crashing in a decidedly non-Boss fashion and will still whine and play the victim.
Then you get the older nobs with more money, who just want the necessary formality of a licence so they can put the Beemah away for the Summer and hoon around on a Blayde or a Boo-sah, innit....
If it instructors did it for the love it would be free, at the end of the day it is a business and like all businesses you'll get some people who are there because it's a wage and some people who have a passion for their job but at the end of the day even they're still doing it because they've got bills to pay.
But most are fully booked often enough that it's pretty much a guaranteed regular income, at which point they can focus more on the love.
I wouldn't bother going through another CBT, if you really must I'd find another school and pay for a couple of hours one to one out on the road. It'll cost about the same as a CBT but be much more useful.
As I mentioned, some may insist on a CBT (even a partial) just to be sure that everything was properly covered and the OP was not given duff (or even dangerous) instruction.... depends on the costs, really.
Thing is these places also run off word of mouth and from the experience of others.
Not that many new riders looking for a school will have spoken with other riders already. Most will just want a local place that looks good.
We had one up at Lightning round our way, by the name of Jonathan, who had one of the worst reps around. Bad temper, impatient, nasty and aggressive, with the highest rate of students failing their tests.
I believe he was eventually fired because he lost his rag with a student, flung his lid in rage at something and then stormed off, leaving three L-plate riders with school bikes stranded at the roadside... but I believe he was fired because this wasn't by any means the first time he'd done this.
Now Lightning were a large school, with a good 8+ instructors, so no shortage of slots for a replacement, yet Jonathan managed to stay there for years while the complaints against him racked up.
But they still have a captive market - There are at least four bike schools just in Reading and they are always busy. The upside is that there's options if one doesn't meet expectations.