If I said I have an account with unibet that cannot be limited, would it be worth running a big balance and what sort of long term profit should I expect?
You can expect a yield of 4.5%. Note though that it does not help with a big balance since they do not allow very big stakes on most events. You will just end up with a balance that can not be put to use. I think around 2-3k€ is sufficient.
Have you stopped betting? Especially if not, can you name bookmakers which have good limits? Unibet and paf seem to be ones atleast.