meanreversion,
I know trading rooms that are happy to offer 100% to traders with good records and who are happy to leave capital in their accounts but you are right these are traders who tend not to require leverage or run overnight positions.
Some traders have trading styles that mean they have extreme peaks and troughs and so are happy to stay somewhere that will provide capital when they are struggling and give up a percentage and then buy the house out when times are good but just have that flexibility. Most traders are also much more cosmopolitan and within a trading room a lot of crossbreeding takes place and traders are able to swap asset classes and even trading platforms easily and so they do not become entrenched.
As I say, it is very much horses for courses, trading rooms do not suit everybody, trading from home doesn’t suit everybody, no one is right or wrong here, despite what others might imply. Trading rooms have their place that is all I am trying to say.
As for the costs, £ 1,250 per month is the cheapest we have ranged to £ 2,000.00 for a complicated set up with lots of screens so your costs look about right, again ruinous if you are only making £ 3,000 to £ 5,000 a month in P&L but pittance if you are making tens of thousands a month.