$ 0.00 offers permitted?

Please clarify. I have been receiving offers for $ 0.00 for my items for sale. How is this possible?
It is the old e-bay trick, the true price offered is in the shipping, avoiding all the fees.
Ebay collects fees on shipping charges, so so much for the "old ebay trick".
Yes-as Peter stated. Sometimes there is only a choice to Make Offer. I think people may post a low offer, just to ask a question. Ridiculous, but unfortunately may be the case.
The personal aspect is no longer there.