Trading COULD work, I think, and it’s always a neat feature to have when ‘collectibles’ are involved but… so far, I have yet to see a system within a mobile OS app/game where it worked without creating a giant mess of new cheaters-related problems that have - more often than not - spiraled out of control.
That said, coming from someone who’s played a bunch of different mobile OS TCG/CCG games and has seen each of the games fall in the realm of trading/gifting owing to poorly implemented trading features, the people who abuse the system, and the companies who either refuse to be or have problems being more proactive at punishing cheaters, I will play the part of saying, “DANGER DANGER DANGER!” and say that the measures taken to SERIOUSLY minimize exploitation would have to be extreme along with the punishment in order to implement such a feature in its intended way while dissuading people from abusing the system.
Trading (and lumped with it is the whole invite-a-friend system) is great amongst honest people, but it seriously ruins a game when the system is hole-y and cheaters and exploiters take over and there are no strict and consistent ways of dealing with the fallout that results.
Everyone wants to believe that people are honest but really, all anyone needs to do is look up any of the popular mobile OS TCG/CCGs to see the extent of cheating that goes on in regards to gifting and trading - even in well-monitored communities - and its impact on the various communities.
If people who were interested in trading/gifting were you and me and the bulk majority of the other forumites in this community (we got spammers here and who knows who else, so that’s why I didn’t say all) who play the game legitimately on legitimate devices and pay for our purchases legitimately, then yeah, it would work.
But… that’s US.
Not… the people who are getting themselves sandboxed or who need to be sandboxed or the people who get sandboxed later as opposed to sooner.
A couple of particular concerns that weren’t really addressed in the OP:
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Cheaters are going to have to be even more rigorously dealt with and on a -very- timely basis. Previously without trading or gifting, the cheaters could only claim prizes that they are otherwise not entitled to. We have plenty of griping about this already. But with the addition of a gifting and trading system, the cheaters who haven’t been caught will also be able to trade/gift ‘bad’ characters gotten via illicit means.
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The possibility of ‘cloning’ characters and ‘fake/bad’ characters would have to be addressed (besides sandboxing players) to either help ensure that honest players don’t accidentally get bad characters traded to them/gifted to them or to help deal with the problem when it arises. Previously, these ‘bad’ characters would be stuck with the cheater and their account. Sandbox the cheater, sandbox the characters, end and done. If these characters were allowed to roam about and people accidentally traded their legit characters for illegitimate ones, that’s a &%$#load of support tickets and “I GOT CHEATED!” threads that will be born.
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How do you keep people from creating multiple accounts for themselves? On first glance, that may not sound like anything important, but I’ve seen it happen entirely too many times - someone trades in their characters/cards to their alternative ‘new’ account and use that new account to game what would be equivalent to the MMR and scaling here and then score big and then trade the rewards back to the other account/another account and rinse and repeat. Yes, I’m aware that people have mobile OS accounts and Steam accounts; I’m not talking about those sorts of ‘multiple accounts’.
Trading/gifting, to me, is a can of worms; new features are great and games need new features to not be stagnant and a trading feature would work so well for a game like MPQ, but especially for a feature that is so easily abused at the detriment of the community at large - again, look at all the other online TCG/CCG/collectibles-related communities - it needs a good strong dose of prophylactic preventive measures implemented to make sure that the can of worms that’s opened is a can of nice juicy nightcrawlers and not a whole bunch of stinging centipedes.
… Okay, bad analogy; fish love centipedes, too. But… you get the picture.