Generally you'll make more on domains that have traffic by parking them. Most advertisers don't want content on a page they just want the handoff to the advertiser to happen quick which is the reason parking companies were restrictive on letting users add anything to their parked pages as Google didn't want it and the reason the most generic looking pages always performed better than fancy looking pages as the goal was to get clicks not confuse them with graphics, other content etc... That's the reason the domain sponsor default page was always the simplest page for many years outta a handful of options as they had millions of domains running through their system so free statistics to back up that decision.
SmartName had shops (applied and never heard back)
WhyPark (RIP)
DomainZaar (hosted script )
Amazon AStores (no custom content options or banner options)
Various mini site builders (they charge btw $200 and $400 per domain)
and the earnings on auto generated rss feeds rarely if ever equaled domain parking earnings. Throw adsense codes on those pages and you'll get a $1 click here and there and then after Google looks at quality then those clicks turn into .02 and then your users get an email saying their adsense account has been disabled as no unique content.
Unique content=Yes
Same RSS feeds on hundreds of domains=No
I admire your willingness to listen to users and try to make adjustments or develop what users want. In my opinion though...
If a domain has traffic park it or do real development not rss automated development
If it doesn't have traffic straight to a clean sales lander
If ya wanna hybrid which is what I do clean sales lander with a couple text links or banners out of the way in the side bar or footer where the sales page is still the #1 focus of the page
I've done smartname shops, domainzaar, amazon a stores, various mini site builders and have a folder of quite a few domain sales scripts, mini site scripts from the last 14 years of me testing and analyzing numbers.
So think you should focus more on clean sales pages and market features over anything who's primary content source is repetitive RSS feeds as that was the rage 10 years ago and where are they now?
Good Luck as options are good just feel RSS is like I just woke up in 2006 all over again and I know the ending already and it's bloody.
In da middle of working on a site but I'll look at yours and Efty and make a list in the near future of what I like and don't like and then you can copy those ideas free of charge.