Cerrano makes a good point, I will explain it a little deeper. You get 8 AAA players valued at $200,000 each on paper. The way a lot of owners draft in here is maximizing the value of their starters and then filling up their roster with useless 200K scrubs. The AAA players are actually RL players the SIM has assigned a fake name to and they can be VERY valuable and helpful and have actual values ranging from around $1M to nearly $3M. There is a thread for helping to figure out who they really are - called AAA revealed. **LEARN THIS** The advantage in doing this is to know how many PA or IP to expect from your AAA players. As an example - I have a AAA OF in one league named Judson Fitting. Turns out he is really 1997 Jon Nunnaly with excellent power and speed. Awesome sub, hitting .340 and I'll get 265 + Plate appearances out of him. I can drop whatever OF scrub I drafted and use that cash on the WW.
So what a lot of owners do is drop ALL the scrubs they filled out their roster with, call up all of their AAA players - take the cash - upwards of $1.6M and get a decent RP or spot starter. Or if you drafted short at a certain position - say only 400 PA's you could get a decent sub at that position.
Warning - be very wary of the Waiver Wire and use it sparingly. There is a 10% transaction fee. So if for example your $6M stud 1B is underperforming and you decide to pick up another one off the WW whoever you pick up comes at 10% charge. I.E., a $6M WW pickup will cost you $6.6M. Thus effectively dropping your team value from $80M to $79.4M. Do this a few times and you severely hamper your team competing against teams who have kept their $80M value. A pickup here or there can help you, but don't go crazy. Hope this helps.