I can't see, in my wildest dreams, why anyone wouldn't deal a prospect for any ace under 30...not even counting Santana. I'd include Hughes in deals for any of the following, among others in no particular order:
1.) Brandon Webb
2.) Dan Haren
3.) Scott Kazmir
4.) Carlos Zambrano
5.) Jake Peavy
6.) Josh Beckett
That's not just me being a Sox fan...I'd trade any of our prospects for these guys as well...you've gotta look at the risk over the reward:
You're betting, by turning down those deals, that your prospect is going to be as good or better than those guys? The odds of him turning out to be BETTER is slim to none...so the only thing you have to GAIN is maybe 4 or 5 years which, in today's era of free agency, may prove insignificant. Plus, in trading them, you're still getting a young guy, but a guy who is beyond the learning phase and a bonafide big-league hurler...a process that takes a year or two with 99% of guys.