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Manamune on Jayce is even less effective than on Taric... There's just no point since he already has passive mana regen. It's effective on Yorick and Urgot, and AD Bruiser Nid can use it well. On anyone else though, not so much.
No real need to get to mana crazy on Jayce of all ppl. Others I can understand.
Jayce, however has a built in mana regen w/ his melee form w. Just go last hit a few creeps w/ your melee form and you are good to go. What makes jayce so great is he has incredible sustain once he gets the lifesteal part of the BT. He can get health and mana back so fast.
The thing about Muramana is that it's probably better on champions who don't naturally expend their mana pool fast and/or have ways to get mana back, because the point of Muramana is to convert your excess mana into damage. If you use it all for your spells already then you don't have much to spare for the item toggle.