Do you really believe that the Asgard gave us their whole technology, everything they knew just because they were dying?!
How silly is that?
Of course, they demanded something.
Since they'd first met Jack O'Neill and Samantha Carter they'd known that those two were meant to be. Therefore, they'd decided that they should use their remaining days and work out a plan to get them together.
They'd known that the president would agree to a lot of things to get their technology and knowledge. But they'd really surprised him when they'd told him what they wanted: no more frat regs for the SGC.
And we all know that they all got everything ...
P.S. Sorry, I just HAD to do that.