Thanks for the help with mine.
I have to admit that I'm not all that familiar with auction values, so hard for me to really opine. However, the way I'd think about it is if you can keep unlimited players, and you believe their cost to keep is lower than their price next year, probably worth keeping.
One exception: I'm not a big fan of paying for saves, even Chapman. Closers come and go so fast whether due to injury or poor performance that you can spend very cheaply on them at the draft, be active on the waiver wire, and do very well. My strategy has always been to draft 3-4 guys at the very end and then make moves. This year, my closers, all drafted in the very late rounds were:
Joakim Soria (out for year)
Jim Johnson (probably got him in 3rd to last round)--one of best closers this year, traded him a few weeks ago.
Brett Myers (undrafted): got a bunch of saves and traded him
Kenley Jensen (drafted for holds, but then one of my best closers)
Tyler Clippard (drafted for holds, but then became a closer)
Greg Holland (great closer of late)
Grant Balfour (got in last month)
And I'm blowing my league away in saves. Rather use those $ (or higher draft slots) for offense or SPs. Chapman may be the one exception due to his added strikeout value, but closers are still so hit and miss year-to-year. Look at guys like Storen, Mo Rivera, Bailley this year. They provided no value and were drafted high.
And I'm blowing away my league in saves