You'll get as many customers as you can. It's normal to expect something positive if you're the one running it and you're the one who's allocating budget on it. There's nothing wrong expecting a positive outcome.
When it comes to marketing signature campaigns are an excellent option to find clients, it is a suggestion anyway, if they run a campaign for 4 weeks you have to understand that they may also be limited in terms of money available for marketing, too there is the option of marketing with social networks, maybe a contest where they can win a prize and get people to visit the site.
Although marketing represents a good business model, you must know how to execute it and so far the site is doing very well, I hope that they can achieve the relevant results and continue to grow.