Bitcoin fees are more like "tips"m there is no negotiation involved. When someone posts a bitcoin transaction to the network, they can optionally include a fee along with it. When miners bundle up transactions into blocks to add to the blockchain they give priority to transactions with higher fees.

Of course, the huge problem here is that there is only an incentive to add substantial fees if the number of transactions is larger than the maximum the network can handle. If they increase the blocksize to allow for more transactions per minute then there will be less incentive to pay fees. The fee system is also not very friendly to microtransactions because its not percentage based.