No doubt Charles, Deion and Randy made their teams better. And ET would make this team better. But the point is it's a significant leap to say that had those players not been signed (or traded for in the case of Haley), all hope for those teams (and this team in the case of not signing ET) would be lost.
Personally, I believe the Cowboys would've had the same result in '92 had they not traded for Haley. They had gone sequentially 1-15, 7-9 and 11-5 in the prior three years. And in the case of Deion, the biggest factor IMO wasn't adding Deion to the Cowboys, but deleting him from the 49ers. The Cowboys were the same 12-4 in '94 and '95 with and without Deion, respectively, and 10-6 in '96 with Deion.
So, had they signed ET all would be sunshine and daffodils? Unless, of course, he had a season ending injury in OTAs or training camp, in which case there would be no reason to watch the team, right?
I'm not criticizing you or any season ticket holder for selling your tickets. You paid money for them and it's your right to do whatever you want with them, including selling them to an opposing team's fans. It's just the ridiculous notion that the season is lost in March because ET or any other player wasn't signed in FA. That just supports my assertion that the primary value of big name FA signings is energizing a fanbase.