Yes, fabric IS an addiction.
But...
...you know you have enough fabric when... it turns into a business! Unintentionally. (Yikes! What have I done??)
But personally, for me, I realized I had enough when it was sufficient to simply have it pass through my hands for a little while... I no longer have to permanently own it.
That was hard, in the beginning though, to see my very *favorite* selections all "go away". But in the end... saying goodbye to them means that you get to have more fun, because you get to buy more. (Isn't that what it's all about for some of us? Playing with color and texture and pattern, combining and re-combining?)
Don't get me wrong... there's a whole LOT more to running a fabric business than just choosing the next fabric collection. (Most of the tasks are much less fun...)