Say I spend 300$, shouldn't this be enough to get the best gear easily? I like to do things fast, I would spend money if it weren't like pocket legends where when I spend a lot but am still very poor.

Here's what my strategy would be
Buy the 41 character
Buy 500k with platinum
Then buy locked crates?

I quit pocket legends after I realized there's no way I can gain gold without spending hour upon hours running the same dungeon even though I reached maxed level there