Here are some possibilities:

What variety are you growing? It should be Fragraia _____ of some kind. Certain varieties produce more than others. Is your variety everbearing?

What is the season in your country? Light intensity may be an issue with everbearing although you may be growing them indoors.

http://www.nal.usda.gov/pgdic/Strawberry/book/boktwent.htm

It sounds like you have good leaf development. Here is a paragraph on leaf number and yield:

LEAF NUMBER AND YIELD. The number of leaves per plant in late fall is used as a measure of leaf area, which in itself is directly related to the number of fruits borne by the plant the next year. Many of the buds in leaf axils turn into flower buds, and usually, under average conditions within a variety, the more leaves, the more flower clusters. The older runner plants in general have the most leaves and greatest leaf area and produce the most fruit. A two-leaf plant in October may have one small fruit cluster of three to five berries, while a fifty-leaf plant may bear a quart of berries. Different varieties have different numbers of fruit clusters per crown and different types of flower clusters.

http://www.nal.usda.gov/pgdic/Strawberry/book/bok9teen.htm

Another issue is pollination. Bumblebees normally pollinate strawberries, so if you are inside pollination may be an issue. It sounds like yours have not fruited yet, but here are some pollination pictures.

http://www.pollinator.com/garden/strawberrypol.htm

There are also fungal diseases that can affect the flower and pollination.

Baci, these were some great links! Thanks for sharing.

I have been thinking of doing some Winter greenhouse growing of strawberries myself. When i get close to that point these will be a nice thing to review more closely.

Thanks!
Poppa

Thanks, Poppa. When you start your strawberry project, here are a few tips made by other posters:

http://search.gardenweb.com/search/nph-ind.cgi?term=strawberries&forum=hydro&forum_name=Hydroponics

Strawberries are not necessarily simple plants to grow. When you start your project, please share with us what you have learned.