We are using the niche mainly because of SEO, client acquisition as well as user acquisition reasons. Exhibition stafff is also a very lucrative niche because germany is the biggest exhibition country in the world and trade fair hostesses actually earn pretty good money: about 13 € to 15 € per hour, which is about 16 to 19 $.
We had some customer requests in the hospitality market, mostly catering staff. So I guess this is the next market to enter. However nurses could be an interesting market as well, we are not totally sure yet.
Our vision for the longterm is, to be the "oDesk for onsite staffing". So everytime you are looking for a temporary worker that works onsite, you hopefully go to our online marketplace.