I think it's completely up to the individual to decide how much value they see in LonaRPG. At the very least, I have no intention of complaining about the fact that you, yourself, don't think it's worth paying $120 a year for.
But people who justify getting games for free just because they are not worth much to themselves are ...... Well, that's funny (I'm not saying you are).
If you're only willing to pay for the finished version, just don't play LonaRPG until it's finished. Or, in my opinion, you should only play the free trial version that is officially distributed by the developer.
If the developer himself had explicitly said somewhere in this thread, "I'm offering LonaRPG to everyone for free, and I need help with debugging and translation." then what I said doesn't apply to anyone, though.