My aproach to evaluate it:
Points that must be taken under consideration:
- it is very rare (so far i think only 3 exist) - this adds to value
- the Degeneration buff makes it a bit cheaper to skill up (but then you need to buy Generation if you want to skill it up as fast as other rare pets - this may be more expensive after all)
- the +20% Skill Gain - Pet and Taming - this one is very nice buff but ONLY for tamers - so its very specialised buff.
- if you compare metabolic rate with any other pets with +20% strength on this its very low - that is good meaning it will cost less for having it spawned (After reaching 30 lev) to have great buff.
- higher level requirements though - so more cost to reach it.
- it depends "how big" and clumpy it is. For example Exarosaur Ancient Strong is spawned to close behind and its big head is pointing through my avatar sometimes making it harder to aim - making it almost useless when taming (it is really annoying o have big pet like that behind when taming). So if it is not annoying like mentioned Exa - great! If it is - then not.
Since Rubys are selling at ~3k peds for Devil/Dragon and 4.5k peds for Kanin atm.
This one is probably more rare than Rubies.
I think you would find buyer at 5k-6k.
But who knows - mayby much more since it may be considered REALLY rare.
Falagor