It has been about one week or a bit more that no new signature campaigns are available. The only two ongoing and still active seems 777coin and Bitvest.
Maybe the reason is the signature campaigns are not that effective compared to the cost they have on the company running them ?
Not at all. There are probably more campaigns now than there have ever been so the advertising is very effective. It is just a supply and demand issue. When slots become available there are a large number of applicants due to the influx of people that only came here because they think they can make easy money. The only reason 777coin and Bitvest always have open slots is the campaign manager has high standards and most of the applications are rejected.