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Dunno - tubeless One is heavier than standard clincher One, to the tune of about one inner tube. Then add sealant... as a system it may well be heavier. Although we don't carry the weight of the sealant around the rim as the wheel spins, so it's not all bad.
After sealant, tape, valves and the additional cost of tubeless specific tyres it's difficult to see when as a system it would work out cheaper than a clincher, if that's what you meant by a saving.
Still you might get less flats - I haven't flatted my Ones yet after 500 or so miles, but then again I hardly ever flat on the road anyway. <--- jinxed4lyf
Hmm. Well it'd represent a saving on tubes, and there'd be less weight.