Interest rates. Profit from trade = 6.18-4.51 = 1.67 ($167) Cost to carry: $45,457 x 5.25% = $2,386 / 365 = $6.54 x 23 (days) = $150 ***Not much more profit than leaving the money in the bank at 5.25%. ***If you can avoid the interest rates then take advantage.
No, it is part of the cost. In that old screen shot, there were 23 days to expiration. The riskless rate at the time was about 5.35% and the strike was 450. 450*(23/365)*5% = $1.42. This assumes no dividend. You can buy a T-bill or buy this spread for less than 448.58 net of all costs.
Opportunity cost. You can buy a risk fee T-bill or do this spread. This spread is not Risk free. There is pin risk and dividend risk.
"I am sorry but does future contract have carry cost or dividend cost?" It absolutely does. The difference between spot and future includes net carry - assuming you can do the cash/carry trade.
correct the "cost of carry" is built into the price of futures. But lets say that noone including me cant hold a position open for long. We can still do futures options and underlying future for far term and hold it for free (since future does not have any of those cost to carry.