While the number of OpenStreetMap users is smaller than the number of Google Maps users, don't assume that it is less complete and that contributions are of low quality. OSM is edited not just by casual users who want to contribute something back, but also by companies who are building a business on top of OSM (at my local OSM meetings in Romania I am one of the only people there who is not a professional developer).

And for many small countries, OSM coverage is often more extensive than Google Maps. I spend a lot of time cycling around the Balkans, going down unpaved roads that draw little traffic, and I'm finding more and more that there's nothing left for me to contribute to OSM: other people have already been there and mapped it first, while on Google Maps many of those roads are missing.