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ok, i will send 0.500 steem again now

Don't any bid below 1 will be considered as donation☺

I already told @booster that it was not a donation, because I sent 0.500 SBD and 0.500 STEEM,

Even though the system they work on had rules, which mean they don't control each bid they receive, the system does , so it's automatically detect any bid below 1 as a donation.

actually it harms the customer, because there is no donation system in interacting with @booster, I have long subscribed with @ booster, even I have been flaq by haeijin because I subscribe with booster, formerly they return SBD if bid below 1,

Agreed, normally there's a refund system but due the large of the small bids that abuse their service they stopped the refund command.

yes, I have sent 2,000 steem again to @booster with the memo as before