buyer wants me to change format so they can buy it now

i have listed 2 items for sale a buyer has asked me to change them to buy it now so they can buy them out right however although i don't have any bidders as yet both items still have over 5 days still to go and i have 17 watchers on one and 6 on the second and i feel that i could would be robbing people of the chance to bid on it if they wish and i may get a better price but on the other hand the item may go cheaper or not sell at all, not sure where i would stand either if i did change it? as never had anyone approach me in this way before

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Orignal From: buyer wants me to change format so they can buy it now