It depends on how good you are at upselling and cross-selling. If you have a tightly targeted user base and are the market leader in that niche, there is a lot

It depends on how good you are at upselling and cross-selling. If you have a tightly targeted user base and are the market leader in that niche, there is a lot you can do. For example additional services, job board, JV with suppliers for those businesses,etc.