Howard, you don't understand arab's point (which, actually, doesn't cause me any concern whatsoever)...
If the mkt as a whole offers to buy the spread from you for a particular price, it doesn't matter who is on the other side of it and whether it's a specific participant or many. Mkts are complete and the mkt price for an instrument, whatever this instrument is, represents the amount that you're being paid for assuming the risk inherent in the instrument.
So let me rephrase arab's question (not that it's likely to help, since I remember this question asked a long time ago in this here thread)... Why do you think the mkt is buying these spreads from you at a particular price that you're selling them for?