It's probably a scam as there's no way to know if the developer is actually skimming your hashes off the top and sending them to his own pool. But if it isn't then it's still probably not worth it since you'd eventually wear out your hardware or the cost of electricity would be more than the money you'd make.

So if you got devices you don't care about and free power, you might be able to make a couple pennies 

It's a real problem. Even as the mining community moves to more and more efficient ASICs the difficulty also keeps increasing. It's a real argument for moving to PoS but all the miners will resist since they have invested so much money already.

Its never too late. In the grand scheme of things, bitcoin and the cryptocurrency space as whole is still very new and anybody getting in now is definitely still an "early-adopter". You can always look at the altcoins, there are more and more launching every day. Just wait till you're buying slurpees with bitcoin.

I'm sure in a couple of years, when bitcoin goes mainstream, we'll be seeing them everywhere. Once crypto debit/credit cards become available, its gonna take off.

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