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.
As positive as I am about LRM and as much as I usually agree with you grnbrg, I have to say that MaxwellsDemon is correct here in that you can only really make that comparison if you bought btc for the sole purpose of investing in LRM and would not have bought btc otherwise.