To get a better payment of course.
Not all members on this forum often switch signature campaigns there are those who stay on the campaign for a very long period of time, although he has a chance of getting a higher payment, the reason may be to get a signature campaign that lasts longer than just one to two weeks.
There are members who make signature campaigns as their main income, and these members will certainly prefer long-running campaigns even though the payment is not large especially if the value is sufficient to finance their lives, certainty is more important.