It didn't help. You buy credits for responses (or fill in surveys yourself), but they are not being filled unless you boost points. Meaning that you pay double price - for responses and for boost points.
Reply Surveyswap.io:
Dear Anna,
I'm sorry if the site didn't automatically allocate your survey with enough respondents. You are right about the boost points, this feature we recently removed. In a few cases, it was leading to an unfair situation.
We apologies for this.
Could you get in touch with our support staff to correct this? I hope it's still on time.
Kind regards,
Arie Lindenburg