Hi,
Welcome to NP.
As for the appraisal, I recommend you not to consider estibot value (you can take certain metrics from estibot, but that's it)
In my opinion, the end-user price may be somewhere in the range of $XXX to $1,XXX if you are lucky enough.
To value your domain, you should probably check for similar sales on Namebio or DNJournal.
From a reseller point of view, I think you can get anywhere between $5 to 30$. As a recent sale, edaf . org sold yesterday on Flippa for 35$ (it was 19 yrs old), same pattern (VCVC) as yours.
Radu