This question is for those who knows ins and outs of options orders execution mechanics.
There is something called "retail order priority" or similar. My understanding is that if a retail customer places a marketable order, market makers have some kind of obligation to take that order even if it is not profitable for them. Also, the size is limited and personally I could never get a fill for more than a singe lot.
I'd like to hear from someone who knows how this works from the market maker's perspective and whether or not a single lot is indeed the biggest order size that gets preferential treatment.
Thanks