Hi.
At this time, to charge for tickets, you need to purchase Event Tickets Plus and also setup WooCommerce or Easy Digital Downloads (EDD) as your eCommerce solution and use whatever payment gateways they support (either supports PayPal).
We have an existing feature request to not need an eCommerce solution: https://tribe.uservoice.com/forums/195723-feature-ideas/suggestions/3762678-charge-for-event-submission-and-premium-featured-e
If interested, please do add your vote there.
This allows us to gauge interest in this particular feature request, which helps us prioritize our development efforts.
Last but not least, we have a pretty great Refund Policy so you can buy one or many of our add-ons and thoroughly test them.
I hope this info helps. Let me know if you have any follow-up questions.