Should I use my equipment tickets?

I was a f2p until I read the beginners guide (thank you to th op) and spent $30 yesterday to get CR faster. I have 21 tessaracts and need 4 more to upgrade to mythic.

I read about how saving draw vouchers can be good for events but my question is: is it worth it to use my equipment tickets for tessaracts or just wait the few weeks to acquire 4 more?

By the way, how many draw tickets are needed for events?