Everybody is correct in their opinions, but Indian context is something everyone overlooked! 36$ isn't such a bad deal if you consider the 4$ price paid by the OP...... Unless it's the case of serious hobbyists, nobody in India wants to buy a fish worth more than 4/5$...... And moreover when the OP wanted to sell quick, I think he got a pretty fair deal. Also ZZ's are not so cool in these parts of the world (and very very common too) as Kamfas, Thai Silks etc..... that is another consideration.
But nonetheless, a lovely specimen that is..... But I wouldn't have been interested if it was pegged at 50$...... I could have gotten myself a few ZZs in 4$ each, grown them and kept the best for myself.
Don't get me wrong..... I know guys in India hankering to buy Channa Barca for 400$ plus, but then again they are the serious hobbyists I was talking about!