No, you don't need to do that, but if you don't, you should realise that that results in biased data, and thus influences the focus of development. If you have an alternative other than "the developers should just magically guess what would make users happy", then I'd be happy to hear it, but otherwise, that's just the way the world works, and thus that's the trade-off you will have to make.

Then less people will use there new version. If they want to rely on this one datasource only be prepared to have it gamed or not reflect reality.

Well, again, it'd be great to hear what other information they should rely on other than magically guessing what people want.