Please Don't Give Up. I love this site it's fantastic.
Make the sets are sharable as Quizlet or Cram sets. Picture associations are always good. Pronunciation is always good. A Free version is a desideratum. A paid version could be for no ads (if you go the ad route don't go crazy like quizup). A paid version could have more customizability.
Thank you for the inspiring words. I can assure you we are not giving up. It's just that we are short of funding and because of that each of us had to engage in other parallel projects. We do experiment with new features and if time permits, we are willing to release some new extras soon.
We do have already support for shareable sets (we call them word lists), as you could see in this video tutorial: https://www.youtube.com/watch?v=j-tNVfD7fFI . Here you can see some shared sets in English: http://lexicum.net/#en
If you are interested to get a sneak peek into our experimental features or discuss how Lexicum can be more useful for you, please vote at http://lexicum.uservoice.com or send an e-mail to firstname.lastname@example.org.
Once again, thanks for your support!
Product Manager at Lexicum