I think as long as you have the resources and the room then there is no problem.

Resources also includes intangibles, like time and love, as well as money and adequate facilities.

I was a one cat person until I my 'one' died. I got 2 then because of my circumstances but I see that really once you have gone multi-cat there is not much difference between having 2 and 6 or more.

The difference is room for them to be themselves - if i had a 1 bedroom flat then I think more than 2 would be a problem.

Money - you have to have enough to feed and de-flea/worm them and also for vet bills - which are not inconsiderable. If you do then fine.

How many have you got?