Why would a seller prevent you from carrying out a "Buy It Now" transaction not accepting offer/bid?

Two China based seller have now refused to accept any Offer/Bid/Buy It Now from me. I have never purchased from them previously.

I did asked one of them for some information on an item but they have not replied and the refusal at that seller started coming shortly thereafter. Now a second seller has refused for the same looking item with similar specs.

My feedback information show all positive feedback from sellers. 

I have asked for feedback from them as to why the refusal.

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To add - save yourself the headaches of inferior products and buy local.

That also keeps jobs here rather than bringing in more Chinese foreign investors. Smiley Wink