An average YouTuber can make $3 - $10 per 1,000 views depending on the niche, country etc. So if you averagely receive 50,000 per day, you would make between $150 to $500 per day. So monthly you could earn between $4,500 to $15,000 without any sponsored videos or selling merchandise.
The top 1% of YouTubers make around $1,000,000 - $5,000,000 per year from just ads alone, add this to their existing businesses and they have a very nice lifestyle.