Well they may not pick your currants for free, but I bet they'd buy the jelly if you made it to sell.
Currants are fantastic fruit, both black and red.
I make jelly the easy way, stems included in the boil. It adds a little note to the flavor which we like. This also makes it a lot easier to pick em - never by the each. Boil and steep it first, then stir in the sugar, then pectin and you're done. Great stuff.