Hello there! We’ve discussed this a few times in the community. Research shows that if we required phone numbers the leads would drop by a substantial percentage. It’s always an option for them to add it, but most do not want to be called. As for the budget - thank you for this feedback, we’ve relayed it to the team 
You should also check out our upcoming Round Table with the Wix Arena team, where we’ll be discussing updates coming to the Arena https://youtu.be/LRW0E2v35gM