I am still very much open to writing call options (covered) for shorter terms (at max. 1 month). Just PM me or reply in the other thread and we can work something out.
(will probably only reply tomorrow though)
Covered call is same as naked put.
If you are trying to benefit from the interest portion, you can check out ICBIT on future contract.
As a bitcoin holder Naked short put is not the same as covered call.
Basically I would be levereging my losses when issuing short puts, while covered calls wouldn't influence my downside at all.
Observed from a "Zero asset" position, your argument obviously holds true, as the payoff of both should in theory be the same.
Additional, I think that people pay a way higher than fair premium for calls, but don't do that for puts. You can see that on bitfinex, where shorting is nearly cost free!