Question
It seems that support for a marketplace could be consider a competitive advantage if it's tightly integrated into the transaction, so should this be built in house, or use a 3rd party app to do this.
What do AirBNB, Fivver, Thumbtack use?
Answer
Looks like this question was 3 years old. Freshdesk has come a long way in past 3 years. I will recommend trying Freshdesk, with their new market place it opens up possibilities. If you need any help with Freshdesk, send me a note or call me.