I wouldn't accept.
The horse has demand only to certain people- (since a portion of CS doesn't like / favor horses over other storepets)
However, there is also a portion of people who favor Malks, Malk fish, and DEFINITELY that Malk cat.
That storepet could potentially go for an 09' rare, or maybe two.
That cat has a bit of demand- as it looks like a tiger, (and in some cases, peoples' pets)
Malk cats in general have quite a bit of demand- the bettas are just an addition.
None of the items they are offering have "demand" or rarity, since most are store items. The pets don't really add up to anything big,
I wouldn't accept because I see it as unfair- the demand on bettas seems high, and I know for a fact that the cat has a high demand. (it is also an 09' rare if you didn't know)