It's worse than that. The new pay structure is such that you don't get any bonuses until you have been with the company a long time. Let's follow a typical career.
AMF has to hire 500 hour pilots before the regionals get their hands on them, so they'll go into the Bro. They'll sign a 1 year contract but never get a bonus (they use to). Then they'll move into the PA31 and get stuck in a 6 month comitment of some sort. Just as that ends they'll be offered a 99 slot with a 1 year contract. Then, just as that ends, they'll be offered a 1900 or Metro slot with another 1 year contract. After they finish their first year in the Metro they will only be able to get a bonus if they sign another 1 year contract. If they do that they only get half of the new and wonderful retention bonus.
Let's do the math: 1+.5+1+1+1=4.5 years of contracted labor to get roughly $2000 bonus.
Then, if they get the Bro captain they'll have to sign another 1 year contract and will only get the 1/2 bonus if they sign another 1 year contract after the first year.
Now we are up to 6.5 years and they get a whopping $4000 in bonus money.
Before it would have been close to $8,000 if they follow the scenario above.
This seems more like a scam than a retention plan.
Or maybe they are trying to get a union started? I don't know.