Your last sentence is very true. Judging by the very nature of the cryptosphere, any developer who has the skills and the motivation are here to make bitcoins by creating hype around a project. This brings me to a question. If most of the "altcoiners" really are intending to sell their scam coin and tokens for bitcoins, then are those "altcoiners" really bitcoiners right from the start?
If that is really the situation then being an altcoiner is really an illusion and the people supporting them are scamming themselves into thinking that they have a future.
Speaking as a developer of a vaporware altcoin, I think that is mostly the case, although I do think there are a few cases of developers who genuinely thought they could maybe do something as important as Bitcoin:
Dan Larimer
@fluffypony
Vitalik Buterin
These guys have lead a lot of innovation. However others might argue they are just raking in BTC and enjoying themselves farting around with hair-brained ideas which won't pan out to anything significant. I hope to be in their league but with a clearly not hair-brained design and concept. And in that way, I hope to do something challenging or better Bitcoin. But you shouldn't trust my words. Always look to the actions and results. Of the three above, I suppose @fluffypony is in the lead in terms of solidifying results, although Vitalik I think has had the biggest ideas/concepts impact with Dan a close second.
There are other examples which are less prominent. For example, since the developer of Byteballs is not selling any ICO and is awarding the tokens to anyone who can sign from a BTC address, then I think his intentions are very sincere (although I don't expect him to achieve anything near Bitcoin's scale).