Exactly what they say! its funny I have been using cloth now for nearly 5 years, and when I started there was a frenzy over nappies like Goodmama (and other ones that I can't remember), then it moved to some other expensive types, and you couldn't give a Goodmama away. Then its slowly moved away from the 'collector status' IMO and more towards the workshorse types that last and are 'Frills free' but cute, like tots bots, or blueberry.
I would really say to try a few cheaper ones out and see what fits and what you like and then go with that, try not to over think the selling on bit.
But if you want to buy just to try and then possibly sell on, then buy like a used car, let someone else take the hit on the first sale and buy like new second hand, from then on no one really cares if its had 2 or 3 owners