You may have a "sizeable audience" and just don't know it
Your "small" blog might be bigger than you think:
" ... only about 20,000 blogs (a mere 0.4% of all active blogs) have a sizeable audience (more than 10 regular visitors and more than 150 hits per average day) ... "
Incidentially, Technorati now reports the existence of 7,333,841 blogs.
(Thanks to Newmark's Door.)