10$ USD is a bit on the high side, but I wouldn’t mind paying something like 25$USD for a full bundle of 3 games.
Honestly though, I think your view on being afraid of getting scammed is uncalled for. Especially when the dev already has a history of making full releases and demos.
Likewise, anyone can pirate anything, just don’t try to justify it as some moral crusade when it’s clear you’re only doing this for your self. :/