Digital BW, The Print

Is there a reason why people aren't modifying the Epson (spongeless) 
carts and using those? I'll say that I've never taken one of those 
carts apart, but there must be a way to refill them. I can't see it 
taking more than a grinder and a drill to modify the cart for the 
refill. Even if you have to fill both chambers, that just means 2 
plugs. Somewhere on the Epson site is a description and diagram of how 
those spongeless carts work, and it seems like it should be a fairly 
straight forward task to modify them.