While the contents might not sink the boat, if they flood back out of the head, you certainly might wish they had...
Spend the $10 and replace the joker valve.
The reason you don't need a vented loop from the toilet to the holding tank is that the contents of the holding tank won't sink the boat if they syphon back into the toilet.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.