If you're trying to "win" a trade as it happens (i.e. an unbalanced trade) people aren't going to want to trade with you. If you propose a trade that will benefit both parties in some way, even if they don't like the initial trade, people are more likely to respond if they think you're throwing out something reasonable. Suggesting they take Russell Wilson and give you Arian Foster isn't going to find any takers, or likely to generate any return offers. Suggesting something more reasonable that at least has the potential to improve both teams is more likely to start a dialogue to eventually get you what you're after, even if the initial terms aren't the same.
You might also just send an e-mail, asking "I'm interested in Matt Forte, anything on my team you'd consider trading him for? Player X and Y are off limits, but I'd consider anything else." That not only gives them something to look at and consider, it might tell you exactly how much that owner values that player, which is good information. Sometimes they'll take less than you would originally suspect.
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