I'm not really familiar with Bitfinex but can you just deposit USD there and get daily interest?
If that's the case, why aren't everyone just doing it? Clearly I'm missing a point about margin trades.
Oh, NXT-9E2Z-J8XM-HKYU-G2GC2 BTW :-)
The first good question!
I will try to structure my answer:
So, why is it better to have USDbitfnx than managing the own bitfinex account?-
simplicity: Several steps of work are not neccessary when using USDbitfnx instead of own account. E.g.: No managing of swaps, security concerns, everything is in the NXT AE account in one place.
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tradebility: When using the own account to provide USD for swaps you are bound to the lending time. To get good rates, one has to offer +15 day terms. This makes the funds stuck for a longer period and also never all funds are available at the same time. Once this asset takes off, the tradebility will be very good, with enough liquidity in the market for this asset.
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competibility: When using this service, the funds are actively managed, thus resulting in an average higher lending rate and shorter downtimes (funds not lent, this is a big problem). The time alone that is needed to do this would only be worth it for larger accounts!
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profitability: Given the points "tradebility, simplicity and competibility" you have to calculate with opportunity costs. Will the saved time, the higher lending rates, the shorter downtime, the higher liquidity be worth the fees, that I am charging for this? If yes: then you would be adviced to use this. If not: well, then you should actively manage your own portfolio!
Regards,
PS: Sent all funds!