Based on the information I found, here's what you need to know about v0 Teams and Vercel account requirements:

For v0 Teams plan:

• Costs $30 per user per month
• Each user gets $30 in included monthly credits
• Additional credits can be purchased and shared across the team

For Vercel account requirements:

• Hobby plan users CAN'T collaborate on teams - the Hobby plan is limited to personal projects only
• All team members need Vercel Pro accounts to participate in team collaboration
• Vercel Pro costs $20 per user per month

So to answer your question directly: Yes, if you want a v0 Teams plan with 10 people, all 10 users would need to upgrade from Vercel Hobby to Vercel Pro because:

1. Hobby accounts cannot join teams or collaborate
2. Team collaboration is only available on Pro and Enterprise plans
3. Each team member needs their own Pro account ($20/month) to participate

Total monthly cost for 10 people would be:

• v0 Teams: $30 × 10 = $300/month
• Vercel Pro: $20 × 10 = $200/month
• Total: $500/month

The good news is that Vercel Pro offers a 14-day free trial, so your team can test the collaboration features before committing.