The thing about Matagi, Vave and especially Evans is that they had proven they were ready for first grade right away, which means they had what we needed. Note also that these three are attacking forwards, whereas Twal is more of a worker. Keppie hasn't even played reserve grade, so he is totally unproven, plus he isn't an impressive attacking player, which is what we need.
O'Brien was a backup player on minimum salary, ready to do that job, so hardly an investment. Stromquist isn't even contracted to Parramatta - he is a part timer who plays for Wenty. Willis Meehan came to show what he's got and it turns out he didn't have enough, which is why no other club wants him either. At least Klemmer and Vaughn are proven quality first graders, which is why their current clubs are paying so much for them. If they were playing for us we would be paying a lot for them too. And maybe we wouldn't have a better team than the Bulldogs and the Dragons, like we currently do.