It's all pretty simple,  not just for this mask. Sunglasses,  apparel, vehicles, boats, e.t.c..
1. Do you like it,  yes or no. 
2. If you like it,  are you willing to pay the price, yes or no. 
3. If yes,  buy it. 
4. If no, walk away with your head held high. You made a decision. Done deal. 
 
Dave