Is it a rare variety that you would be able to brag about and possibly resell 1 or 2 polyps of? If so then I would say why not, go for it. Otherwise, or if you want the colony, then probably not. You might be better off getting something that you would be happier with faster.
That said, there is a good point in the quality over quantity saying. If you like it and it is not too expensive, get it.