Removing comments like this also removes the feedback button at the bottom of the page - so no way to get feedback from the customer if you remove it like this. If you just want to not show the comments you could take advantage of the fact that this section is clearly identified with section id="discussion" and simply set an additional css class to hide that. Or edit the template, either using the front end edit html tool or on the backend by editing the view with external id 'website_quote.chatter' (name ' Allow Comments & History'). That way you can still encourage feedback if the quote is not quite right without overburdening the customer with reams of chatter.