You say that like the salary cap doesn't exist. Put it this way: if we signed Luai but were paying him, say, $6m a year I'm sure we'd all agree that would be a terrible idea - it would mean every single other player on the roster would have to be on minimum salary. If we signed Luai for $250,000 a year, by contrast, I'm sure even the biggest doubters would say that was a cracking bit of business.
Agreed? So by definition you also agree that there's some point in the middle of those two numbers where opinions will reasonably be divided. Personally I'd love the Tigers to sign Luai, but I'm very hesitant about the idea of doing so for $1.4m a year.
Here's an example of why: the Broncos signed Adam Reynolds for $800,000 a year. Is Luai $600,000 "better" than Adam Reynolds? I guess you could argue it. But I bet the Broncos were glad they had a bit of wiggle room when Reece Walsh became available a year later...