Platinum. When purchased, it gives you an edge. But is that edge worth it?

I recently bought 2550 plat for 90.00$ usd. I was planning in capping, but upon further investigation, the 60m bonus elixir (the moat costly one) only grants 60% exp bonus.

Anyways.

My question:
Is spending all that plat on the elixirs worth it? Will i run out of plat before I cap? Also, i was planning I spending 1k plat to get 1 mil. Since I'm relatively new, I'm asking advice in both these topics. Thank you.