How do you determine a value or asking price for low pop cards?

[philliesfan]

I know I posted scans of these cards previously inquiring as to the value of these cards but I cannot find that thread. I got opinions to their values but I don't recall if they gave me reasons why.

So, how does one determine an asking price for a low pop card. Example, I have a 1955 Bowman #200 Dick Littlefield PSA 9. It is the highest pop and the only 9. There are no 9Q's, or 8.5's and only 25 PSA 8's. I know the PSA guide says $250.00 and we all know their pricing is way off.........I was offered 3 times that amount previously.

I have a 1951 Bowman #224 Billy Cox PSA 9. There are 2-PSA 10's, 8-PSA 9's, 2-PSA 8.5's and 63-PSA 8's.

So, what do you guys take into consideration when setting an asking price? Or do you just find out through EBay or a larger auction house?

Thanks,
Robert