I can't comment on the boat - but you have made three basic errors on the RIBnet ad.
1. You have no price/guide shown
2. You have no email address or phone number shown
3. You have no photos
Only a registered member can reply to you by PM so that would put quite a few off. I'd second Pikey's take on it. That is a specialist interest vessel and there is a limited market for it - but the right buyer will show up.
If you do not have the boat advertised on Boats & Outboards and Apolloduck then you are behind the curve there too. IIWY I'd be doing that, getting her gussied up for viewing and putting a few photos and back story on the ad. I can remove your last post on the ad if you wish (I would