Well, there might not be much to invest with in the first place.
Disregarding the forums, RJ is delivering a product (free information guides, dating profiles etc). And with all due respect, this is not a unique offering on the world wide web because similar information is highly accessible elsewhere, including smartphone/tablet apps that have established themselves on Google Play/Apple Store/Marketplace etc. As Google et al expand, Internet domain holders have the opportunity to profit from advertisements.
Other websites circumvent the competition by creating apps that are simply a weblink to their site. Some have a mobile (m.) version.
Since this thread was delivered on the All Things Gay section in the forum...perhaps most of the demand is to use the app for using the forums more easily than doing it on a smartphone browser. That's not exactly game-changing logic to invest in an app purely for that purpose.
More often than not, a website exists to serve itself. To play the game one must purchase Internet real estate and maintain it with servers. Build the clientele and watch the ads churn out your income. Unless it costs $2 or something to purchase the app, it is a dead investment, compared to the current desktop standard.