Is it worth spending 1.5g or 50 silver for elements?

[BestCatGirl]

Do they give good weapon xp and cost less in total than if i were to upgrade a true infernal weapon with dropped weapons?

[Medeis]

Elements are good for once you get to true siren and further where it's far more costly to use dropped weapons than to make elements in the long run. For now continue to use dropped weapons (NOT the ones that require soulstones to feed).