I enjoy getting early access titles. There's a certain charm to helping shape a game with feedback as you watch it grow into something great. It also mean's I've had my share of burns though so I get why not everyone wants to risk it. I've gotten everything from the gems that were Subnautica and Die Young, to the finished yet disappointing to many The Forest, to the endless dev cycles of 7 Days to Die and Project Zomboid, and the apparent abandonment of Stay Alive Apocalypse, or the descent into aggressively microtransaction fueled p2w that was Crossout...to name a few that stand out.

That said, Valheim already has a good amount of fairly well polished content that would already be worth the price for many even if it never got updated again (although it actually just received a content update, even if it was a minor one). I've already got over 150 hours and haven't actually beaten the current content available. So I'd say it's already worth the price tag and I didn't even get it on sale. If you are going to take a risk, this is a pretty good one to risk so far. If not, you can always wishlist it and check back later when it's further in development just to be safe.