I think your quesiton was directed at me, so I will answer.
First, those posted swap values are directly from the platform, not a broker's website, so the values are accurate.
Second, they are adjusted to reflect the actual order sizes as per Michal's earlier post, so they are accurate with a correctly hedged ring.
Third, these trades behave in much the same way as correlation trades, which with I am very familiar, so I believe the positive swap would be maintained unless an interest rate change from the broker affected the values. I can't see how it would go negative.
Fourth, if a positve swap ring is opened at the correct time when the FPI is at a negative extreme, there should be very little negative movement in the net value of the trade, except for the spread cost when opening the trade.
But, as others have noted, trading these rings for swap doesn't make a lot of sense. Earning $1.50 on a ring with a spread cost of $150 (first ring in the earlier pic) requires one to stay in the trade for 100 days just to break even if we are trading this for the swap potential. And, the total interest earned would probably be somewhere south of 10% per year. Not very exciting...
However, if we trade for the swing action profits, that is a different story. Consider the GBPUSD/USDCHF/GBPCHF ring in the previous pic with almost $400 in positive movement after the spread is deducted. If we assume that it takes approximately $4,000 to enter the trade (given 100:1 leverage and approximately four open orders in rough numbers
), and we are able to capture $200 of that movement in net profits, that is a 5% return. If we can do this 10x monthly, it starts to look like real money, especially if we can compound our gains.
But... (I hate that word!), please keep in mind that the EA screen shot reflects the extreme values even if those values were only touched for a fraction of a second. This system will be viable if we are actually able to enter/close trades at those values without a requote, delay or other broker nonsense.
I have done it, as have others here, but not often enough. I'm still working making this a practical system for my group.