DY: Wolf makes a good point. There is no Chelek in Olam Haba, but Mistama he gets S’char for the Tzedaka.
I won’t claim to know the Cheshbonos of the RBSO, but if you would take the fact that an Apikores is Dino K’goy to its logical conclusion, then maybe he can only get S’char like a Goy, in which case he would (according to Pashut P’shat and Tosfos; though other Rishonim do argue) only get S’char if he did it Lishmah and not to make any money off it.