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On average $1,80. So that is 80 cents profit.

so after 7 days we will get back .80 steem and sbd. so that means the deal is .80 sp for .20 sbd...

No, you multiply your 1 SBD to a value of 1.8 SBD split in half SBD and half SP. So over time you'll slowly see your dollars go down, but the same amount appear in SP. Example: ten posts, you spend 10 SBD. In a week you will have 9 SBD back but also around 9 SP.

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