Actually, for me, this is nothing more than an additional activity in the game and a way to diversify the gameplay. I like looking at skins at https://dmarket.com/ingame-items/item-list/csgo-skins/knife/navaja%20knife. Doppler looks very cool, so I'm looking at buying one. It is worth remembering that skins only improve the appearance of the weapon and don't affect its characteristics.