This, whilst out of date, is a very realistic guide to what you can earn from a travel blog (as opposed to miles and points):
http://www.travelblogchallenge.com/t...urvey-results/
See q2 with over 70 per cent making under $500 per month.
The readership numbers on this site
http://www.heatheronhertravels.com/w.../press-and-pr/ which is one of the best know British travel blogs are also enlightening.
15,000 uniques per month and 44,000 page views. That is under 10% of what I do on Head for Points.