It all depends on for how long your listing has been live and which upgrades you've applied.
The number of views (31) isn't anything to get excited about. An average 7-day Flippa listing that is featured once should get in the vicinity of 500 views, unless the headline is absolutely horrible and/or the site doesn't generate any revenue.
What's strange, though, is that almost everybody who viewed your listing (29 people out of the total of 31) became watchers which is something I haven't ever seen before. Did you tell your friends about the listing by any chance?
EDIT: Then again, this also happens when you re-list your site (all watchers of your previous listings automatically get added as watchers to the new listing), so if it was a re-list then this would explain it.