Yes, entirely based on luck. But, as I said, certain items and events will increase luck chance overall and should stack in some way. The idea of the needed being account-bound is so more active players don't flood the market with them.
The luck events are 'organic' in that they will occur automatically - triggered with a mathematical algorithm based on how active the community is. I haven't been able to flesh out the 'community bonus' events very well without a player base yet. ^^;; I'm really inspired by Pokéfarm's bonus counters (
info on their wiki)!
Anyway, no, the legendary-status pet I was dreaming of in my last post won't be tradeable, neither will it's materials. However, I can imagine the NPC that exchanges these materials into pets for you has several pets at a variety of rarity tiers! Some of these materials (and pets) will be tradeable, and some won't.
I'm thinking that you should be able to upgrade or fuse together some of the materials so if you don't happen to get the super rare one you need you might be able to eventually collect (or purchase) enough of the smaller (tradeable) versions. This would allow you to "pay to win" rather than rely on pure luck, but not in a game breaking fashion.
If you collect another set of the needed materials you should be able to make another copy of the pet, yes. And, if I ever put a limit (soft or hard) on how many pets a user can have, non-tradeable pets will never count towards the limit.
I think that answers everything.
This is my rough draft of the new species (some things are subject to change):
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In other news: My gf's got some amazing talent and recorded a bunch of purrs, trills, chirps and squeaks for the creatures of my site. It'll really help flesh out the bestiary and games in the future~! As an example, I really like
this sound clip in particular.
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edit: Also, woot, post #100 on this thread!