I made three warlocks just for the purpose of getting it to thirty. Once I got to thirty, I pretty much grinded the raids, nightfalls and weeklies three times to get things I didn't have (I kinda want every exotic in the game)
And with three warlocks, I got 27 strange coins each week. I slowly started getting exotics from xur and legendary gear for my soon to be made hunter and titan. Now I deleted one warlock and made a titan.
With three warlocks, I have almost 50 raid completions and the best part was being thirty for about 3/4 of those 45+
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This is about what I've done just haven't gone for the 3rd yet
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It's not a bad idea imo. It gets you great raid experience, lots of experience with the warlock (which are useful in vog), and you don't have to find gear for your third one. The only down side is that it gets a bit repetitive, only using the warlock. But I love warlocks. Even now playing as my titan, I haven't gotten used to not having a ranged melee and flame shield lol.