The essential reason they cannot even close to this number is given here (TL;DR they are completely bound by the currently set 340 ada minimum pool fixed fee):
The reason the @cf-team gave me for not doing this is that they currently, as arranged by the protocol itself, effectively pay almost the entire 340 ada fixed fee for each of the pools they delegate to. I then realised this is because the CF delegation for each pool is generally far greater than the pledge + the rest of the delegated stake: especially so for the small pools.
More simply put: if the CF doubled the number of delegated pools it would double their fees… perhaps more, since a larg…