According to their site rules, you can check the reputation of the seeler, just like Ebay. here's the translation for you :
Qualifiers are potential buyers of tools dedicated to Okazii ... to take informed decisions with respect to the transactions they want to carry out. Before you buy a product, users can check the reputation of a seller by the number of ratings received, resulting from the transactions.
What is a qualifying?
The qualifier is the unit of measure for the success of a transaction online at Okazii.
The rating is given at the end of a transaction by the two sides of the transaction.
General rating is listed by Okazii. en: any positive rate leads to an increase in our overall with a point, any negative rating decreases the qualifier with a point. Neutral does not affect the rating grades.
If an object that has already been withdrawn from the bid at an auction, and it is included in the minimum bid, the seller's rating decreases automatically with a point.
Only the seller and the winner (one for a normal or more if instant sale) may be granted for a qualifying transaction completed. These ratings will influence the rating of the counterparty. The qualifier is the number that appears in brackets () next to the name of the user.
It is forbidden any action undermining the integrity of the ratings system. According to the terms and conditions Okazii, if a user accumulates a general qualifier 3-(minus 3), his account will be permanently suspended and will not be able to buy or sell.
Also, according to the terms and conditions Okazii, if a user will receive 3 negative ratings in the position of the purchaser from the 3 salespeople in a period of 30 days, your account will be suspended altogether because it does not follow the rules of the Okazii. The user in question will no longer be able to list, buy or participate in the auction of that time.