Maybe in some areas...but I've found a lot of support and encouragement from co-workers and family with my decision to adopt as a single person without fertility issues...
Your right, there are single mothers who choose adoption as their first choice. However, even in the "Choice Mom" community, about 70-80% choose sperm donation rather than adoption. Also, even in the LGBT community the vast majority of us (especially lesbians) don't choose adoption as our first choice - we turn to donor sperm or surrogacy arrangements. So SAVeronika does have a point, for most parents (especially those adopting domestically) adoption is generally a second choice (but not second best).