We can hope that webOS Nation will fix it's login system here.
pivotCE displays the existing preware feeds and can also link to IPKs on the web. Though it hosts a handful of apps that were unable to find a home elsewhere, this requires hosting space. I think there is an ad on the site near the bottom, but we are mainly funded by donation. Renting sufficient space to host thousands of apps might exceed that small income.
I don't know if webOS Ports have any kind of plan for an app (& maybe other services) server, but if they did, they may well have the same income issue. There may also be the need to security check submitted apps - which would likely require a qualified person or at least sophisticated software (if it exists).
I have in the past proposed a model where users pay a small fee for remote services & catalog access, then a fair price for apps. The fee would guarantee operating revenue (according to / depending on userbase), and app sales would give some income for devs and admin, but I don't know if it would work economically - especially when people expect a lot for free, but it's either that or the advertising / data grab model, but the latter may not even work with a small userbase.
In short, I'm unaware of any service able to replace the WN app Gallery or any one planning to do such a thing.