As to practicing playing music, being productive and making lots of music...pffft. sounds obsessional to me. I'd rather spend my time acquiring stuff, which takes far less effort.
And as for everything needs to have a use - I may not play some synths regularly, but they all have uses. Some have really pretty lights (B2600), some fill gaps on stands/racks (all the Junos, and they have great gaps to place drinks on at the side without having to worry about spilling them as those Junos are f**ked already), some add colour to the studio and make it a more pleasant environment (blueberry 303). And the rest just make me happy, so they have no more reason to exist than that.
