Another thing to keep in mind is that the price of Bitcoin has more than tripled since the IPO. That helps, too.
Edit: To rephrase that: At IPO, a bond was worth around $15. Based on the trades over the last couple of days, a bond is worth... around $17.5.
grnbrg.
That's a relevant consideration only if you keep all your money in fiat and bought coins only momentarily in order to buy LRM bonds.
Otherwise, the useful comparison is to keeping your BTC in your wallet.