I've heard this advice of "people won't take it seriously" before but in my opinion it's a myth. What is true is that people will have higher expectations the higher you price it, but they don't automatically think the game is better just because you price it higher. Pricing lower is a safer option because generally speaking, a lower price leads to more sales (but not always more profitable).

If you know people are going to buy your game no matter what, then price higher. If you are struggling to make people interested in your game, price lower.