.. this trade took place in? Do you know where they are in their repective races? How immediate is the pitching need? Who is the opponent this week and where do they stand? How about next weeks opponent; and the week after that? If not, how can you determine value and need? If I lived on a lake I coldn't give water away. Move me to a desert and I can name my price. Market value is market value. I have posted for trades in many leagues and received no response.
Your comparison of this Guillen trade to a situation with Jeter, Garciappara and A-Rod is a stretch a best.