I would try this for your equation. Keep in mind that this is an array formula so when you enter it into a cell, submit it by pressing CTRL+SHIFT+ENTER and it will calculate your value of two largest numbers while ignoring the "*" character.
=IFERROR(IF(COUNT(G39:G50)=1,SUM(IF(LEFT(G39:G50,1)="*",VALUE(RIGHT(G39:G50,LEN(G39:G50)-1)),G39:G50)),LARGE(IF(LEFT(G39:G50,1)="*",VALUE(RIGHT(G39:G50,LEN(G39:G50)-1)),G39:G50),1)+LARGE(IF(LEFT(G39:G50,1)="*",VALUE(RIGHT(G39:G50,LEN(G39:G50)-1)),G39:G50),2)),"0.00")
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