Seriously, why?
Let's say Surtain and Horn are there at 10, and the Cowboys have them ranked basically the same. Why would they not take a pick from Philly (say #84, which is a fair trade) so that Philly can take Waddle? The Cowboys get their guy, and Waddle was going to end up with the Eagles or Giants anyway. Why would you not make that deal? And why would the Eagles' status as a division rival matter in the least?
If you're looking at a clear BPA at 10, then it would take a lot more to get you to trade out of that spot, but again, why would the division rivalry matter?